let's go back to tanya acker, blogger for the huffington post. criminal defense attorney bradford cohen and clinical psychiatrist, dr. dale archer. dr. dale, in the first case, it was a wild out of control chicago mob. in the second case, prosecutors say these four teenaged males entered the home intending to kill the occupants and allegedly proceeded to murder the mom in her bed. officials say their goal was to rob the home with the intention of killing everyone inside. is there any way to explain this kind of sadism we're now seeing in the country and in the city? >> well, there's no doubt that violence has taken on epidemic status. in just a few statistics, 60% of kids have witnessed violence. 60% of kids have been assaulted and 20%, 20% of kids have seen a shooting. so there's no doubt it's an epidemic and there are three reasons why. you alluded to them. one, violence on the internet. two, violence on tv and three, violence in video games. kids are seeing it every single day and teenaged years are tough enough, always have been, but now that