Why do people get angry?

A person usually becomes angry when things do not go his way, when he is misunderstood by another person, or when his viewpoints clash with another's viewpoints. We become angry when we are accused of being  wrong, when we think we are right. Our perception causes us to believe that we are right. According to the other person, he believes that he is right. Because we do not know how to reason and because, we have no foresight or intuition, we become angry. When we are insulted, we become angry. We become angry when we incur a loss. In protecting our pride or our greed, we experience anger. If one is to become free from pride and greed, he must have awareness (spiritual). Say for instance, your son-in-law broke your china tea set, would you not control your temper? If your servant were to do the same thing, should you not control your temper in this situation as well? Our reactions vary in different situations (from situation to situation).