You typically don't see conservatives, libertarians or classical liberals behaving this way. Partly this is because most of us have jobs, families and better things to do with our time. Yet even if we did have a few hours to spare and felt strongly about an issue the usual response is to write a letter to the editor, draft a blog post or perhaps even organize a peaceful protest. The key difference here is that when we look at Medicare, Equalization or environmental regulation we don't see an all powerful evil. Instead we see a bunch of crooks, politicians and activists, manipulating an electorate that is too ill-informed and too distracted to realize what is happening.
The world view of the Left is, by contrast, far more bleak. It is dominated by powerful corporations and corrupt governments. Only a small band of heroes defies this ruling clique, fighting valiantly for a "social justice" that will one day create a utopia for all. For those who don't merely accept this narrative, but actually live in it, trolling a minister of the Crown is small potatoes. Even smashing windows at a G20 conference is a tiny act of retribution. The amazing thing isn't how crazy the Left is, but why it isn't even crazier.
Having a Somali Muslim lecture anyone on "compassion" isn't just crazy -- it's downright delusional.