Although L. Wayne Mathison mentions this as a Canadian phenomenon, I believe it’s endemic to the Anglosphere and probably all of the former “first world” democracies:
“Free Palestine/Anti-Israel protest” by Can Pac Swire is licensed under CC BY-SA 2.0 
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After watching this, my takeaway is simple: Canada has developed a small, permanent protest class that moves from cause to cause, looking for confrontation, attention and social-media status.
These people are not trying to persuade anyone. They want to control the space, silence opponents and punish anyone who records what they are doing. The cause changes. The tactics do not.
There are extremists on both sides, but the organized activist left has become especially comfortable deciding who is allowed to speak, report or even stand in a public place. Too often, well-funded NGOs and unions provide the money, organization, legitimacy and political cover that keep this protest machine running.
Politicians, journalists and institutions then excuse the behaviour because they sympathize with the slogan on the sign.
A democracy cannot survive on selective free speech. Protest is a right. Intimidation, harassment and mob rule are not.
