When you take in the context that footnipple was replying to, my read is that they were implying a logical connection between the police arresting non-violent protestors and the looting / "insurgen[cy]" that is occurring.

Of course we can't really say either of us is right or wrong, because their statement inherently relied on bystanders inferring most of the meaning from context.

edit: footnipple replied in additional contexts that they've seen "a lot of destruction at the hands of some very bad people" when asked if they'd been in the protests, so I feel a little more confident that my read of the context was correct.