Sounds like he is one of those people who went through his early life thinking he was smarter than everyone else and then when he actually has to take a college level math class can't handle it.  He looks around and sees other people are doing fine in the class and he finally realizes that he wasn't in fact any smarter than anyone else.  Instead of manning up and putting in work he goes into insane fantasies about other people trying to screw him.  This seems to be the nexus of a lot of these shooters, young people that don't know how to put the work in to achieve their goals and therefore go insane when shit isn't handed to them.