" have an immoral authoritarian agenda they were trying to justify. "

That's not fair, some are just racists without any particular agenda besides trying to make themselves feel smarter. People who have a lot or racial pride or identity seem to mostly have no actual accomplishments of their own to be proud of.
Leftists do the same thing when they start advocating for different gun laws for "urban" people. It's stupid no matter who does it, if you look closely more often than not rates of criminality/police abuse/ abortion correlate with poverty rates more than anything else.