1) Minorities are going to have a worse experience anywhere just for practical reasons and additionally because of how human socialization naturally works. That's why we're so concerned about how they're treated and constantly do our best to help them.

2) The plurality or majority that replaces us will not be us and will not share our ideas (liberal democracy, market economies are two notable examples) which naturally we're going to prefer to theirs.

3) Globally people have been exceptionally unkind to minorities compared to how we've treated them. If they replicate that behavior here (and when they've been given the opportunity to they have) that absolutely is a problem.