[merrylander]

There are people who for who knows what biological reason have no conscience, meaning that they believe the world should provide for their every whim, commonly called sociopaths. I have known a couple and they can be charming as hell, just as long as everything goes their way. When things don't they become convinced that it is everyone else's fault but theirs - and act accordingly. They invariably end up isolated and alone, however some can and do become violent, then run for cover.