I'm also not following this discussion and know nothing about the specific circumstances surrounding it (and I'm not a lawyer) but I would think violence is never ok because:
1. What @iluv2travel said.
2. Someone is believed to be innocent until proven guilty.
3. I think we believe in precise, calculated punishment assessed to be a fair punishment for a given crime. Violence is rarely (never?) precise or calculated.
1. So violence is ok when legal?
2. So violence is ok when proven guilty?
3. So violence is ok, just must be in the right context?
My point is, everyone just repeats "violence bad" when in reality they only think that because they thought the victim didn't deserve it. Violence itself is sometimes the answer. If you think not in this case, that's fine. But it's not because "violence is never ok". Bad example, but everyone (I think) is fine with some terrorist financier getting his head blown off.
The Torah tells us in Parshas Shemos
Need I quote all the other cases in the torah where the "violent" person was a Tzaddik? Just look a few pesukim before.