Self destructing to the point of blowing up others around them.

Why do so many players seem to have this arms of Hades mentality to them? To which they are all to willing to want to try and hold others back or simply try and spread a more toxic and angry mentality to others out of spite of their own self inflicted problems? I mean I seem to notice this mentality more than others as once anyone looses control of their emotions they are all too willing to just harm their own team more so than anyone else.