It is a bit difficult to comprehend this kind of behavior without believing they are also mentally unstable. I expect most people regardless of how much they ha

It is a bit difficult to comprehend this kind of behavior without believing they are also mentally unstable. I expect most people regardless of how much they have been wronged wouldn't turn to killing dozens of innocent people. The attacker possibly believed they weren't innocent which to me makes it seem like he was mentally unstable. There is some disconnect between what he believes and reality.