laura: let's discuss whether there any s. any link on violence on the screen and real violence with ben shapiro and retired army lieutenant colonel david grossmanred books on the psychology of violence army ranger, black belt and -- okay, you win. just on that score. it's great to have you both on. let's start with you, david, because some of these games are really wild. i mean, they are pretty graphic, pretty gory. you know them. call of duty. i don't do any of these. >> grand theft auto. >> laura: simulated violence. >> murder similarity. >> laura: evan ramsey others like some of these other killers. klee bold, adam lanza. >> the norway killer trained on those. prepare himself to commit crime. the killer in florida he spent 15 hours a day on violent video games. all consuming all pervasive thing in this guy's life are violent video games. less than a year ago, the american psychological association made a definitive statement. there is a clear unequivocal link between violent video games and violent behavior. the blood pressure goes up. heart rate goes up. violent actions go up. the data is persistent and clear across many different forums. y