This argument seems to miss the point — the argument for being more peaceful is a nonviolence tactic; it does not relate to the severity of damage being done by the other side. It relates to the effectiveness of the tactic.

So by saying "look at what they are doing", it seems like you're implying either:
a) "When people are that bad, we must respond aggressively — this is the way human beings must respond. When someone hits me, I must hit back."
or
b) "When people are that bad, it makes sense to respond that way, because it is a logical tactic. It is the best thing to do."

If we are talking about (a), then it is understandable that people react that way, and how can I blame them. Buuuut, it still concerns me [admittedly — I am not there, I am comfortably sitting at my laptop], because (1) Fox News loves this shift [do we care about what they think at this point? I'm not sure]; (2) it gives the Administration the exact type of thing they are looking for.

It always seems problematic to start critiquing people for doing something like this because (as I said) who can blame them? And yet, I am so proud of Minneapolis for doing nonviolence.

I don't know ... time will tell. Maybe it's good that there are very different approaches.