The problem with most of your "reasonable ideas" (except racially homogenous societies which is straight up racist) is that they have consistently been used for

The problem with most of your "reasonable ideas" (except racially homogenous societies which is straight up racist) is that they have consistently been used for racist reasons in history. I think if you hold almost any of these (except perhaps the first), you should take a good long look in the mirror and research the history behind these.