The YouTube video is obviously a touchy subject, and I haven't had time to dig into the interviewee yet to verify his claims, I only skimmed the Wikipedia article relating to the subject, and it's very thorough, and very well cited from the looks of things: https://en.wikipedia.org/wiki/Race_and_intelligence?wprov=sf...
There’s a lot more, and there’s a lot that the republicans & democrats are both guilty of (e.g. the suppression of studies of cognitive abilities between the races e.g. the gaussian distributions of IQ, despite IQs being comparably reliable in predicting academic success, job performance, career potential and creativity). They like to say “race is skin deep”, while ignoring the fact that even children of mixed-race parents cannot accept a bone-marrow transplant from their own parents - it will be rejected. It literally goes further than bone deep. These are just a handful of observations anyone can verify for themselves.
Democrats would point to climate change as an example of this. They then extrapolate too far, in my opinion, and declare that Liberal=Science therefore Liberal=Objective therefore Republican != Objective.
I think it's clear that this kind of tribal-based reasoning hurts objectivity.