Because you can't let people realize that they are not alone with their opinions about rich people. That's the first step to change, and you can't have that.
Because it's typically the glorification of murder, the incitement of murder, or the direct threat of murder, which are all typically illegal in most jurisdictions.
Reddit is a corporatist pearl-clutching hell hole. With no reason to exist. I left it quite a while ago when I got banned for asking if something would get me banned. Fuck those assholes.
Well, plenty of hate speech is fueled and paid by the oligarchies running troll farms and owning social networks. They don't like the idea of someone rich getting shot at because of abusing society either.