about his life leading up to the bombing tamerlan tsarnaev does not seem to have been taken in by an extremist movement. these anecdotes we do have of his interactions with the muslim community in fact tell the opposite story and paint a portrait of profound alienation from the muslim community. of an extrication from anything larger. we have a mental category for people who commit violence inspired by an extremist version of islam and that is the category of terrorist. we also have another mental category for a pair of disturbed, self-radicalizing young men who create a private world that justifies the most horrific of acts, disturbed sociopaths. as the picture of the brothers' motivation slowly comes into focus it is hard not to wonder if we are seeing something more like columbine than jihad. the reason that matters a lot is because everything about the politics and legal ramifications of what is about to happen will depend on which category we assign this crime. joining me at the table maya berry executive director of the arab american institute and ken