[telephone2]

You are missing a key element of context in all of this. This protest took place "online" as much as in person. This was a giant photo op designed to generate propaganda to drum up support for a burgeoning handful of trumpist/brexit style political movements that largely propagate through social media platforms.

Exercising traditional forms of enforcement (as seen in almost every other protest in Canada in the past 20 years) would have resulted in the generation of sensationalist content that would have stoked a wildfire in the social media support for these movements. (Look at how much the network nodes of the movement pushed the single instance of violence - a horse that got spooked and trampled a protestor.) This is the reason why force was not used, and non violent/commercial methods were used instead.