The thing that bothers me the most is the question why have the far Left/Right wing types all of a sudden increasing in their popularity, and now in demonstration mode. 
There are differences between the middle Liberal/Conservative doctrines, but neither seem to promote what the Alt Left/Right seem to stand for. 

These far Left/Right organizations espousing radicalism in my view are just not welcome in Canada, or anywhere else for that matter.

This for me, automatically becomes a problem should 'proportional representation' voting system is adopted, as that system could open a door to some of these radicals in the halls of our democracy. 

Think in general, the majority of most folks either on the center Left or Right really want just good government and would reject radical views. Let us hope so.