AIBU does not make people behave in any way.
People make people behave in a particular way.
So if someone is a total cow because there's a space on the site where they feel they can get away with it - that has nothing to do with that space and everything to do with that person.
If you took away AIBU - do you think such people would be sweetness and light fluffy hunny bunnies?
No they would not. Because it is not about AIBU.
It's like - a child is being bullied because they, I dunno, they're fat. (like me
) do you say this bullying is happening because this child is here, so we will remove this child and there will be no more bullying?
Or do you say this child is being bullied because people here are bullies. If we take away this child, they will simply find another victim.
Honestly - the problem here is not a page on a site that says AIBU.