Anger can be used for good and for destruction. When we get angry about something that is wrong, it can motivate us to take action and make things right. But, when our anger is out of control it can lead to violence and destruction. Anger is a secondary emotion. Typically we experience a primary emotion like fear, loss or sadness that can turn into anger. Because these emotions create feelings of vulnerability and loss of control, they may be uncontrollable. Anger itself is not a sin, but the strong emotion under strain can quickly lead to sin. Jesus himself talks about anger and tells us what to do in Matthew 5:22-25.
