This kind of thing has a way of convincing people that it’s best to live among there own kind.
Actually, that’s been empirically proven,
ironically, by someone trying to prove the benefits of “diversity”.
It seems that people trust each other less when their
cultures aren’t the same. It’s common sense - if someone
doesn’t react half way predictably to certain situations,
then you’re not going to trust them as much.
A common culture, not “diversity”, leads to a stronger society.