> but a few bad cops are never supposed to represent all cops

I am pretty sure that they do, at least in my mind as well as in the minds of my friends. Especially due to the amount of incidents. You can criticize one side without supporting the other.

> there are plenty of videos people have posted of protesters stopping looters in various places

And there are a quite few where they haven't. This movement consists of different people with different beliefs after all.