I've been mulling something over lately. It's almost a given that one will find questionable elements to older texts; some are overt and some sneaky even to the modern eye. There are, undeniably, many such elements in Tolkien's work, and they cause a lot of trouble for marginalized readers and for fan creators grappling with it in relation to meta and fic.
That the Silmarillion is a largely-omniscient myth-text narrative, composed from a variety of drafts, the discarded versions of which we also have access to, further compounds the issue. Who has read what? Who samples from what? How deeply do some themes pervade both the text and the fandom? There are discarded portions that raise eyebrows (and thankfully, were edited out at some point). However, there are moments where those discarded portions shine through the cracks in exposition, dialogue and reasoning left in the official composite text by the sweeping style of the narrative. The composite can be seen to still rest on certain narrative and valuational presuppositions of Tolkien's - presuppositions he assumes the reader to share.
In the text, of course some have value or more of it, some have honor or more of it, some overcome darkness while some naturally succumb to it. The narrative certainty in these characterizations rests on these lurking (racist, antisemitic, ableist) presuppositions, and in some cases handwaves any deeper exploration or explanation.
There seem to be two fan solutions to reckoning with a cross-draft-consistent bigoted theme. 1) Write meta that explores its traits and manifestations in the text and syncretizes canon assertions with authorial biases, and/or fic that directly addresses the in-text impact of these biases. 2) With an awareness of the bigoted themes, create headcanons, new verses, and fic that subverts, rewrites, or negates the original theme. The former refuses to allow the presuppositions of the text to become the presuppositions of the fandom. The latter allows (particularly marginalized) fans generative space, fodder to create anew, breathing room, and expanded perspectives. Different functions, parallel purposes, both important.
Because it's fandom, and it's large, and our idea of on-the-side fun and not our job or our marriage, we do not have the same preferences for how we go about dealing with these textual issues or the cohesive pressure to be like minded (even as we recognize the need to deal with them). One person's way of reckoning with textual biases or gaps may strike another as reaching too far from canon to be of appeal. This is a common reaction to headcanons, canon divergences and alternate universes, and crack or humor, particularly in the tolkien fandom. However, personal preference is not a basis for asserting that someone is reading the text wrong, especially when the issue at hand is one of reparative analysis and creation.
I am drawn to the issue of the Petty Dwarves. Most information on them comes in pieces from disparate drafts and satellite texts. Some information was erased entirely from the published Silmarillion. However, many people have noted the continual issues in Tolkien's treatment of the Dwarves, the iterative issues with his treatment of the Petty Dwarves, and rightly begin to link the two, plumb them down to their connecting factor, and begin excavating the silences in the narrative which Tolkien allows to be filled by presupposition.
I have found that people who cite personal preference may bring up canon elements to excuse or disprove certain readings; I would argue that the canon elements cited are less often exculpatory of our faves and more often proof of deeper biases, proof of biased presupposition as a stand in for rich characterization. Let me explain.
We hear from the Sindar that the Petty Dwarves are reclusive, aggressive, and territorial (on this they base their initial assessment that the Petty Dwarves are two-legged animals for hunting). We hear from the Dwarves who cross the Blue Mountains later that the Petty Dwarves descend from expelled Dwarves who were the smallest, weakest, most conniving and self-serving, and violent persons. At one point, Tolkien describes the Petty Dwarves as older residents in Beleriand than both the Sindar and the eastern Dwarves, and the original inhabitants of Nargothrond, and it is them who Finrod hires to finish its construction. Tolkien describes the Petty Dwarves as agreeing to do this under false and duplicitous pretenses (for what reason, he doesn't say); later, Mim tries to kill Finrod (again, the narrative is sparse on motive), and Finrod alternately outs the Petty Dwarves from Nargothrond or pays the other Dwarves to turn them out. Tolkien evidently means for this to paint a picture of a group of people who are inherently wicked, cannot help but be so, are hated and pitied (for one does not preclude the other, and all good people should pity bad people, after all), and bring about their own diminishment. There's the in-universe justification for it.
I mean to explore why it is not satisfactory to leave the matter alone at "the Petty Dwarves brought about their own downfall." To begin, why does Tolkien rely on the characteristics he does when describing both the Petty Dwarves and Dwarves in general? These are multiple pieces of bigotry at play, chiefly some old antisemitic stereotypes (which have already been unpacked at length and by Jewish fans who are more knowledgable than I; if other have more to add, please do so). But I will give it a try.
First, Tolkien never pins down why the Petty Dwarves are expelled westward, only vaguely pinning it on their inborn characteristics. One old piece of antisemitism held that Jewish people were smaller and weaker than gentiles; Jewish men are still held to be less masculine, which can be traced from a medieval supposition that Jewish men menstruated. Coupled with the ableism of expelling the stunted and the inutile, Tolkien describes here a sort of itinerant and pitiful scrounger who does not belong in a society to which it cannot contribute and into which it cannot assimilate. The concept of vagrancy and the homelandlessness (consider the antisemitism in the concept of the cosmopolitan Jew, and Tolkien's deliberate linkage of Dwarves and losing their homes), is further connected to antisemitism by the Petty Dwarves being duplicitous, self-serving backstabbers toward Finrod, who Tolkien sets up as innocent and trusting enough to sleep unguarded near Mim, further juxtaposing the two. Furthermore, the gentile assertion that Jewish people are violent is escalated to accusations of blood libel and sorcery. Tolkien may not go that far, but he ties this predisposition for violence into the passage about Nargothrond, and their territorial defensiveness and their aggression toward the Sindar. Jewish people have long been stereotyped as insular, traditional, and cold to outsiders (consider the gentile furor over "goy"). All of this passes under the surface of the text - where Tolkien does not elaborate, this rises to the surface to color the reading.
When fans identify these elements in the text (and realize they are very similar to Tolkien's handling of the Dwarvish sacking of Doriath, or gold sickness, or Dwarvish isolationism as a whole), they begin to investigate the places they show up in text. The meta they write must try to syncretize the canon of what is said with the authorial context applied in the characterization. The fic they write must try to fill in lazy gaps left, and to imagine and then confront the missing exigence to the conflict while refuting the antisemitic presuppositions upon which the text relies in place of characterization.
Because it's fanwork, some people may have concepts that you think miss the mark or push further with assertions than you think is logical. However, no one who is in good faith creating, exploring, or trying to remedy the issues of the text, can be accused of using their ideas as a cudgel against canon or against others. Discussion is welcome, when it is conducted in good faith as well.
Relying too heavily on the surface-level assertions of canon to shoot down these musings at times verges upon what I have described above: leaning into the in-world justifications of hierarchy and subjugation to excuse the real-world hierarchies upon which these presuppositions are built. It is not so important how or when the Sindar realized the Petty Dwarves were people: what matters is that Tolkien created a character group, designed to be hated and pitied but never respected, onto whom he mapped real world stereotypes, and set them up in events where these stereotypes lead. It's highly worth considering why we are defending portions of text that are inherently bigoted. The whole broth here is the issue, but people are quibbling over whether they've fished out a potato versus a turnip.