But just about the only thing that seems clear about this murderous affair is that utterly alienated young men of any religion or ethnicity might suddenly rebel violently. Dzhokhar Tsarnaev’s reluctant rejection of the materialistic American life – even after the bombing, he continued to tweet, attend campus parties, and go to the gym – appears to have been consolidated by what indeed could have been his older brother’s resentment of Putin’s brutal reassertion of control in the North Caucasus.