Ofcourse all types of people are likely intrinsically pretty close to everyone else, but you can't underestimate the effect of culture. Roughly speaking, alcohol is legal worldwide if you're above the age of 18 or so. So why do alcoholism rates vary massively between countries? It's largely 'culture'.
Black american culture has been pretty self-destructive these last hundred years. Look at rap music videos, thug culture, single motherhood statistics, etc. Meanwhile recent immigrants (asian americans) are passing them.
Culture is incredibly powerful and we don't all have the same culture.