Itchysphincter said:
I think they’re crap but if what he says is true if they had any substance they’d beg him to stay on and back him.
Reading that, it sounds like that's exactly what they did.
Seems strange to leave a band which is presumably making you rich because you got hammered on Twitter. Just close your Twatter account and get on with your life. If you're asked about it in an interview, just refuse to comment.
I don't understand the view that he won't 'self-censor' and so has to leave the band. I'm in no doubt there are celebrities who like things that would shock the majority of the world, so they keep that information private.
I'd guess there's more going on with his leaving than what's been said.