I love telling liberals that they can have socialized medicine (as an example) or diversity, but they can’t have both. Of course socialized medicine will eventually fall in on itself, but homogeneous populations with a high degree of trust made it last a lot longer in Western Europe (not to mention Israel and Japan) than I would have predicted. It will all come crashing down really fast wherever diversity is implemented.
Milton Friedman wrote decades ago that you can have a welfare state or you can have open borders but you can’t have both.