When anger in a person is present, don't let anger dominate your life, learn how to defuse anger by using the written Word of God, and some simple suggestions to keep the situation from becoming sinful when it results in violence.

Anger is born of malice, envy, jealousy and of the devil but righteous indignation is not sinful because it recognizes that a wrong or injustice has been committed by an offensive act of some kind against another person and seeks a righteous solution.

We are taught in God's word not to sin when we are angry but to use prayer, and through grace and mercy we can overcome anger just because our God who is full of grace and mercy teaches us that we can be, also.
When a wrong is committed to the point of physical injury, God does not acquit the guilt but punishment is soon to follow. So be of good courage, and overcome anger, be the master of your's and help others learn how to defuse anger through your example, in King Jesus name. Praise God.