People who are laid off or fired can get mad for a variety of reasons other than those three you listed. Someone I know worked a lot to build a particular busin

People who are laid off or fired can get mad for a variety of reasons other than those three you listed. Someone I know worked a lot to build a particular business and was promised by the owner that he'd always have a position there. Then he was let go when the economy went bad. He felt betrayed. Betrayal engenders anger, too.