Cultural relativism is just as much of a leftist fraud as is climate change. But it’s been much more destructive.
The liberal view of immigration says that an MS13 gang member from El Salvador is just as good (if not better) a candidate for US citizenship as an engineer from Denmark. And if things don't work out well when the MS13 gang member gets here, well, that's just the fault of racists and nativists who didn't help him out enough.