In Minneapolis today due to the videos which were captured even those anti-kneeling americans largely recognize the problem and support solutions. But by allowing the rump to be violent (or equivalently, serruptitiously distribute bricks and gasoline) the activists are losing public support.
Roughly 200 mostly commercial buildings burned in the main shopping area for (working class) Minneapolis over the weekend. The food and pharmaceutical desert is going to kill far more of the poor and marginalized than police violence would have, in a city that already votes D up and down the ticket.
The violence is not necessary, nor productive, nor are the situations comparable.
Expecting the protesters to somehow control everyone in the protest, when the cops fire indiscriminately on people whether they're peaceful or otherwise, doesn't seem like a working system.