Recent news has illustrated once again how emotions, unchecked and not released, can cause very negative results. The alleged shooter had a long history of mental/emotional issues, but no one could see the end result of these disorders. He and everyone in his life ignored them, and several people paid the price with their lives.
In this case, we see an unresolved issue of anger directed at a person of authority. In this case, Congresswoman Giffords. His delusions made her the bogeywoman for all his rage, and then he crossed the line and acted them out. He bought a gun in the easiest place to get one, AZ, when no one in his right mind should have let him have one. When the suppressed anger became too much to bear, he emptied the 31 bullet ammo clip into a crowd. The rest of this sad tale is well documented. Sadly, it is becoming all too familiar.