And liberals are psychologically attracted to/excited by novelty. If they can't find it, they'll create it, or invite it. The
quality of the novel stimuli doesn't seem to be important, unless it's something they are already conditioned to dislike. That's why liberals value things like
Piss Christ or the
painting of Mary covered in elephant dung, but if a local church commissioned a painting of Christ or Mary they'd ignore it, no matter how well-executed.
Having an entirely novel people arrive in their country, bringing with them strange food, dress, language, and customs is very exciting to the liberal. A constant influx of novel peoples is constant stimulus of the sort they like. If the government supports this, all the better, that just confirms their attitudes and preferences are normative. Anyone who opposes them is not just different, they're
wrong, they're
dangerous.