This I agree with. Take them down for actual violations they actually are doing, if they are doing them. And don't presume greater harms are happening at any particular place without good evidence.
We don't need to "presume" greater harms, we can rationally infer them beyond any reasonable doubt, just like we can rationally infer that humans evolved from earlier species even though no one observed direct evidence of that happening.
Absolutely not. At least with the passport taking (which is Derec's hypothetical and not mentioned in the OP case) you have very good evidence. Here, you have much much poorer evidence.
You can't just presume bigger wrongs are done by someone when you find a wrong. And you certainly can't rationally infer them beyond any reasonable doubt.