Everyone of these mass shooting psychopaths showed their cards well before their attacks and parents, employers, educators, friends, classmates, online viewers and law enforcement all had the opportunity to see something, say something and somewhere the ball got dropped. Almost every one of them posted online pictures of themselves with arsenals, pretending they are in some sort of video game. The clues are almost always able to be seen by the general public and acquaintances well before these attacks. It's what drives their hatred of humanity and their desire to set the new body count record and get their 15 minutes of fame, regardless of how they get it. The psychological aspects of these attacks are what drives these attacks. The weapons of choice just increase the body count!