Few people are truly comfortable having someone shout at them, shake a fist at them, curse at them, threaten them, push them, or hit them. Watching someone punch holes in walls and doors, smash dishes or shred books doesn't make us feel much safer. What you have witnessed is violence. In the simplest terms, anger is a feeling and violence is an action. They are not synonymous, nor inherently causal, with one predicating the other.
Anger is necessary for survival, while violence threatens survival.
Men are not born violent. They learn it at an early age, as an acceptable response to a variety of stimuli. Then they practice what they've learned until it becomes an automatic response, a predictable pattern. Violent displays can represent a rite of passage into manhood. When they are unsuccessful, they feel that they have failed.