Perpetually Angry People

Below is a list of people who appear to be in a constantly aggravated state of mind. Whether righteous anger or pure selfish indignation, what I find amazing is the ability of these people to keep up the motivation and energy level that it must take to remain this way for long periods of time. So, I thought it would be interesting to contemplate and speculate just what keeps them groaning and which of the group seems/seemed most dedicated to remaining PO’d. Please add your own ideas - whether or not you agree or disagree and to what degree you do or do not.