[gydfi]

That's partially true but I think it's partially a recasting of right-wing thought into a left-wing mould.

The main driving factor is third-world immigration, and in particular the perception that mass immigration from the third world has had deleterious effects on the West, both economically and culturally.

What we're seeing right now is, I think, a preference cascade. For years people have been told that opposition to mass immigration is "racist" and have kept quiet about it, but now it's become more socially acceptable to talk about it.