Righteous anger is not a sin. Jesus called them sons of Satan after they tried to trap him with the woman that committed adultery, but the modern-day interpretation is that there are no consequences for sin. A Marine Corp colonel shared a story with me, it was told to him by a Marine Corp Chaplin. In the time of Jesus, slave owners wore large rings on their right hand. The slave owner was allowed to strike a slave from right to left with the hand open, using the inside of the hand. If he then struck the slave with the back of his hand, hitting the slave with his ring, it was game on as this was not permitted under Jewish law. The whole "turn the other cheek" is used today to insinuate that if you are attacked, you're not supposed to do anything about it. Not what the Bible was telling us.