I agree, but the problem is when 1) those people have large enough numbers to be politically powerful, and even worse 2) when those people have convinced those

I agree, but the problem is when 1) those people have large enough numbers to be politically powerful, and even worse 2) when those people have convinced those people they've oppressed that they should be oppressed, so those victims join them in upholding the oppression. When #2 happens in sufficient numbers, I'm not really sure what the answer is, except to lead by example.