Chemistry
Random thought, maybe not valid. Listening to Dzhokhar's classmates praising the Universal Virtue of
Die-Versity (and that's how they pronounce it!). They can't conceive of their former friend getting violent because in their shrunken toxified walnut-like "minds" all humans are identical particles, moved randomly and indeterminately, without any innate tendencies or souls.
Maybe we should think in terms of chemistry instead of quantum "physics". Chemists know precisely which elements will mix with other elements to form compounds, and which elements are cat-like and independent.
Same with races and ethnic groups.
We have data. We know the affinities of most groups, know which combinations form compounds, which combinations remain separate, and which combinations explode. We know that Japs don't allow foreigners of any type into their own country, and don't mix when they emigrate. We know that Germans, Irish and Italians are good mixers. Arabs form productive compounds in some situations and explosions in others.
How about Chechens? We know that Russia has never succeeded in mixing the Chechens into the empire. They've always been agitating for separation.
Will we learn something from this
data? No, we won't.