And yes, I categorically deny variation in self-control by race.
Does it not bother you that you are echoing the kind of arguments promoted by segregationists and, before them, slave owners? They too detected variations in intelligence and emotional development by race. They too had their studies. They too had their scientists.
Citing a couple of studies - ones that you interpret in ways that suit your prejudices - is not impressive. On any major issue there are thousands of studies. Knowledge comes from a preponderance of the evidence. Anyone can cherry pick studies. Iām sure could find dozens that refute your misinterpretations of those few.
If you want to see knowledge advance, look up the critiques of the Bell Curve. See how flawed studies can be corrected.