No, you’re deliberately twisting my statement in order to make it harder to disagree with you.
You are narrowly defining “responsibility” as “explicitly say that abuse is bad all the time because otherwise everyone should assume you believe something is good just because you’ve written it”. This is controversial not because I or other people generally think abuse is good, but because it ignores the responsibility that authors are already taking by tagging and age restricting their work. “Abuse” as a word refers to a bad thing. A fic tagged “abuse cw” implies that the abuse is bad. A fic tagged “no warnings used” means “I chose not to use warnings, so you may or may not find bad stuff in here”. In both of these cases, the explicit “abuse is bad” line is redundant, and thus should not be expected of authors.
(and because this has come up before–this does not refer to MISTAGGED work. An author who tags “no warnings needed” when they did need warnings does not fall into the category of people who can be assumed to know abuse is bad. Likewise, someone who uses incorrect terms (like for example, tagging “blood” instead of “graphic violence”) for what happens in their fic–I’m only talking about correct tags. Tagged writing does not require further explanation, because the tags ARE explicit condemnation of certain types of content.)
It’s not any author’s job to explain to you that abuse is wrong. If you do not already understand this and expect other people to understand this, then you are either too young to be unsupervised on the internet, or the people who should have taught you about abuse failed you. Those are serious issues that can put you in danger, and I’m not trying to downplay them. However, it’s not my responsibility to educate my readers about abuse being bad. I’m an adult who does not have children, and does not expect readers of my dark works to be children, and explicitly tells children to avoid content I think could harm them. I take responsibility for my work by tagging it and instructing children to avoid it (either explicitly or through “check this box if you’re eighteen or over” messages). You are asking me to further soapbox about how abuse is wrong every time I write something, which is unnecessary and I’m not going to do it. I expect my readers to take responsibility for themselves and either avoid dark content that I’ve tagged, to ask an adult they trust to talk to them about concepts they may have questions about….or even to ask me directly if they’re unsure about something.
There are some problems that are real, and that can hurt people, and that are also not my problem to solve. What you’re describing, the idea that some people may never have been taught that abuse is wrong, is one of those problems that is real, and can hurt people, and is also not mine to solve.
I am also concerned that your response to the concept “people have discussions about whether content is problematic or not” is “it would be nice to be able to prevent problematic content from existing”. The existence of discussion around a work does not mean the work is problematic. This type of black and white thinking is not healthy.