triggers these individuals. what is it? what makes them snap? why are there long periods of time sometimes between people doing something evil. look at the bomber sayoc. 2002, he made a terroristic threat and said we burn down the florida utility company. it took 16 years to actually do something like that. i will add on to what shimon was saying. i spent 25 years in the fbi and 8 in the military, you never get used to scenes like. that it doesn't matter. you learn how to compartmentalize and how to numb yourself, but to see career professionals and see them visibly moved, it had to be often. >> you heard it in the voice of the pittsburgh public safety director, his voice was kwifring and holding back tears when he said it is a horrific crime scene, one that he has never seen. >> he has been through plane crashes, and this is much worse. and you hear this from law enforcement officers, after these kinds of scenes, who have