I raised it because it is very commonly used as an argument against this system because "$ETHNIC_GROUP of people is so bad they can never be recovered". And I

I raised it because it is very commonly used as an argument against this system because "$ETHNIC_GROUP of people is so bad they can never be recovered". And I don't think it matters, what matters is that all members of the society feels included and a part of it regardless of their origins. But the latter is probably easier to achieve in a homogeneous society and you don't have to deal with xenophobia.