The state is fucking powerful. After all, the state is the one in charge of checking the state's power. If you piss off enough people, or merely the wrong people, you may discover that your rights only extend so far as other people are willing to protect them. The difference here is that most protestors are punished via ass-kicking, seizure of personal belongings, a few nights being humiliated in a jail cell, and a bunch of fines.
The people whose lives were interrupted by this are pissed off and out for blood. And Trudeau is going to give it to them, and be heralded as a hero while doing so. Especially after the perceived police incompetence in the matter (by failing to dole out the standard ass-kicking-jail-fine punishment).