If the same angry event happened to ten people, they would all react differently. Some of the ten people would get mad, some would get afraid, some would feel sad, and some would shirk it off. The difference is the personal history of the person and how they have learned to deal with threats, stressors, or loss. It's not what happens to you, but how you deal with it that counts.
Anger is one emotion that people use to respond to threat, stress, or loss.
To be human is to be angry some of the time. Anger, like a hammer, can be a tool for destruction, or to build something. We can turn it inward and beat ourselves up. We can use it to correct a situation that is wrong. All social movements had their beginning in some one feeling angry.