Property damage was very much an issue at the recent demo against police brutality in Montreal. These acts did accompany - indeed follow - an extensive amount of police provocation, abusive arrests, that ended up making the protestors' point about a recent rise in police brutality - to the point of outright murder of innocent citizens. 

So it's a complex dynamic where, in the end, one needs to question notions such as the words "us" "our movements" that bracket Judy's post and may end up reflecting "natural" leaders' alleged owning of a movement. 

Affirming the diversity of the movement(s) and even minority positions within it can too easily be sidelined by such leaders' implicit appeals to a statu quo that hides the systemic, covered-up violence of people in uniform or 3-piece suits.