> If it isn't illegal or incitement of violence, it doesn't need to be removed.

But it can be removed, because its one of many millions of privately owned websites on the internet... This is the great thing about the internet, anyone can create a website and run it however they want and users are free to visit whichever sites they like the most. This is a win-win for everyone except for those who want to control what site owners do with their own websites.

"Can be" and therefore "must be because I say so" are two entirely different things.

It's still an option to just leave it alone. What is this obsession our culture recently has that says "Just because I CAN do something, I MUST do something"?

It's an option to leave it alone, but it's the site owner's prerogative. If you don't like the site owner's moderation practices that's fine, but there's no reason that your opinion should override the owner's intentions with respect to how the site is run and the type of content on the site.