I suspect such people typically come out of strong homogeneous communities that reflect those beliefs.

Maybe Canada just doesn't have many of those communities, given that we have a smaller population than California.

And on top of that, in every one of those communities you have leftists controlling the cultural institutions like schools and the CBC, so even if the broader community holds a set of beliefs, it doesn't see those beliefs reflected back through the media, and it is immersed in leftist worldviews.