lieutenant colonel dave grossman calls it the bigger bang theory. whatever army has a louder noise has a distinct psychological advantage three to one. the psychological component is very important in warfare. and that's why lieutenant colonel dave grossman calls that the bigger bang theory. so aggression if you look at human aggression, nuclear weapons, look at the arms race. the same mentality. that's the part of the brain, the nuclear arms race taps into. it's posturing. it's like two animals showing their teeth. do not mess with us, we will white you. -- bite you. that's the part of the brain if you look at military posturing, a lot of that is the same part of the brain, the posturing instinct. so you think about human behavior, aggression and what causes aggression. what causes aggression? very common cause of aggression is fear, right? frustration. even loneliness can cause aggression. my father had a lot of war trauma from the korean and vietnam wars, and i grew up in a very violent household. and i got bullied growing up because i look asian