There's no secrecy. The FBI can (and should) infiltrate these groups (just like their tweets, and you're in), and then arrest them for their illegal behavior.

There's no secrecy. The FBI can (and should) infiltrate these groups (just like their tweets, and you're in), and then arrest them for their illegal behavior. And, limited in-real-life moderation of illegal posts can be focused on where the crazy people hang out. It should be a win.