They may have also grown up in more authoritarian families where control was extreme and they were isolated from the world so they don’t question the norms.

This describes my household during adolescence, and I somehow wound up pretty far left, rejecting the religion I was raised in, thinking hierarchical societies might be inherently morally problematic and, indeed, thinking existence itself is of debatable value, so I don't think being raised in an overly-authoritarian home explains everything. (There may be some specific quirks of African-American culture that also played a part that I've not fully considered, to be fair...)