I have discovered the source of misery in mankind. Seriously. It's called insecurity. A lack of confidence is the significant contributor to any number of personality farts in who otherwise could be a nice person.
Think about all the damage it does...to anyone. Fear and insecurity cause people to elevate their egos as compensation. Or retract in shame. Or lash out in defence. Or most often to fail at whatever they attempt to do.
I think I have nailed the problems of mankind...wouldn't you say?
Although.....if you are psychotic with a mental disorder, then you can't control your impulses, and so you are excused.