islam and he was devout as a kid. his high school wrestling coach talked about the fact sometimes he would excuse himself for prayers. most of the people talking about him in the past this is not the person that they knew. this is not the boy they knew. this is not the young man that they knew. something snapped. >> right. and, you know, you could ask yourself the same question of a shooter in a church in charleston and shoots that up or in a cinema. you know the million-dollar question and none of us can anticipate is what is that moment? what is the tipping point where someone goes from being a normal good person in society to committing an act. we don't know. when you look at ptsd and you try to identify a lot of troops men and women coming back from iraq and afghanistan have these ishlss, it's almost impossible to identify when those issues manifest themselves and that's the same thing. what we do know is we have to tackle the knowns. isis spread propaganda. they use the social media to