dzhokhar left a note, probably in a botttle.
The note, scrawled with a pen on the interior wall of the cabin, said the bombings were retribution for U.S. military action in Afghanistan and Iraq, and called the Boston victims collateral damage in the same way Muslims have been in the American-led wars. "When you attack one Muslim, you attack all Muslims," the note added.
one thing on which all the parties to the worldwide war of/against terror are agreed is that the locus of moral responsibility is collective. so, blowing up random people on the streets of boston is attacking 'america,' which is in turn attacking islam. the whole interpretation of the event frames it as an attack on america, the city of boston, and so on. if people were not actually distinct from one another, then attacking random bodies on the street would be a rational way to wage war on a collectivity, sort of. that it is demented should show you something about the premise.