"Proportional representation is ill-advised because it could allow extremist groups to get a foothold."  Exactly, Trudeau got this right.  In a 338-seat House of Commons a 1% vote for Muslim Brotherhood, or BLM, or white supremacists, would, depending on the calculation of proportional representation, give 3 or 4 seats to any such radical group or groups.  This establishes a base for growth, gives it a certain degree of legitimacy as well as a daily voice in the public sphere, and perhaps even a taxpayer-funded staff and other resources.  And who knows how many splinter groups would emerge, possibly leading to legislative paralysis at best.  My reading of Canadians is that the vast majority don't want that.