If there truly are meaningful genetic differences between races, then so be it. But that seems to be the justification for the portion of "white supremacist" Trump supporters I mentioned above. It's an angry racism that seems likely to be problematic.

Well, as compared the hypothetical problems this "racism" or "white supremacism" might supposedly cause in the future; the type of "police and all whites are racist" anti-racism you are promoting is having problematic consequences right now, in the form of anti-police and generally anti-white rioting by blacks in places like Ferguson, Baltimore, Charlotte, etc. Not to mention that we'll never solve the problem of large amount of black-on-black crime if we can't admit it's cause.