I think you have hit on the one key similarity, at least in the examples cited. They all seem to feel they &#x27;deserve&#x27; something, that the world owes them a relationship, sex, power, money etc.<p>When they don&#x27;t get it they get frustrated and angry, and eventually violent because they feel they are being &#x27;cheated&#x27;, &#x27;oppressed&#x27;. I&#x27;ve read that that Elliot guy also harboured a racist belief that he was better than african-americans, and thought it a huge injustice that he couldn&#x27;t get a girlfriend but saw african-americans who could.