A pattern I see in many community spaces: a small number of people (even as few as one) can set a negative tone for a group if they are allowed to stick around. They can't be reformed, they aren't interested in shared goals and they will break your community if given half a chance. Best to send these people on their way.
I even created a model to simulate the dynamic: https://jlericson.com/2018/12/12/unwelcoming_comments.html