I used to think this cultural appropriation thing was unsound bullshit based in confused immature slapping together of superficial social justice values like respect for other cultures.
Then one day I was simulating some possible experiences that I would have if I was a Native American, and I caught a glimpse of what it would be like to live in this world, to know the history that got us here, to be surrounded by the people in better conditions whose people persecuted the shit out of my people in some pretty awful ways, to know that my people's culture is literally dying out due to various factors related to that, and then finally to see those other people playing with superficial scraps of my culture, to see them making up and believing shit which just wasn't true, to see them adopting just the bits they like, and to realize that their version might be the one that lives on while my actual version winks out and is forgotten forever.
It's easier to picture this scenario if you have any idea or practice or truth that you actually care about people not getting wrong, because then you can imagine that instead of some bullshit ~culture~ that you don't really care about. Because it's easy for some people to see "culture" as just that - as a bunch of bullshit superficial stuff that doesn't really matter. So find something that matters to you, something that it really digs under your skin to have twisted. Use that.
If you can put yourself in those shoes, that's somewhere between unpleasant and existential-crisis-level horrifying.
And so one day I did that, and I felt it, and then I knew that was worth naming. Suddenly the term and rhetoric of "cultural appropriation" didn't seem like vacuous bullshit anymore - it seemed like exactly what someone might've come up with if they were trying to name that situation or experience. Suddenly it was only natural that if you started with that idea, it would get as popular as it did, that some of the seemingly vacuous bullshit would be un-nuanced application or bad presentation, and that some of the vacuous bullshit would be the result of nuance decay.