"It's just fiction"

I have seen this argument used for lot of things actually. One of its counter argument is:
"But the media we consume affects us and how we perceive on that subject"
"then it's your fault isn't it?"
"No but why is author publishing [insert something problematic] in their works"
"But its you- Yadayada yk how it goes

Fast majority will call it bs when it's used against troupes like rape/abuse/pedophilia etc

Does it only NOT work when it revolves around topic of SA but it does when it's something Illogical?

If we can't use the same argument for every troupe so when is it actually applicable if you do use it. When the series contains something problematic? Illogical? Illegal...?

If you don't agree to any of "its just fiction" arguments share your thoughts as well!

I want to hear you guys opinions ^^