They were still there in the first place. Is a bar that has 2 stabbings a night “safe” if the people with knives are promptly removed?
People being escorted out for being disorderly is very far from a stabbing, and furthermore, there are no public venues of any kind that lack disorderly conduct entirely. I don't really know what you're trying to get at here.
Your “there’s nothing to worry about” comment just showed there was something to worry about.
So by that standard, if there are any incidents of disorder in these narrowed racial colonialism discussion groups, we should regard them as unsafe and seek to further narrow the criteria? For the safety of the people there, who are clearly unsafe from the presence of any incidents of disorder, of any magnitude, ever.