Also when you consider other dimensions of personality that are normally distributed, and intelligence which is also normally distributed... it's not hard to im

Also when you consider other dimensions of personality that are normally distributed, and intelligence which is also normally distributed... it's not hard to imagine the bottom tails of some of those being contributing factors. I sort of think what you're really seeing within that 5% is a majority fraction of "baseline shitty" people, and a minority people of "momentarily shitty" people. The baseline shitty people are likely a kaleidoscope/patchwork of pathologies, and the momentarily shitty people fall within normal ranges but circumstances have pushed their stress levels north of what they can handle.