Two times this chapter of proverbs speaks about anger. Verse 11 says that a person who vents their anger is a fool as opposed to the wise person who keeps themselves under control. Then verse 22 says that an angry person stirs up dissention and a hot-tempered person commits many sins.
Our culture is one characterized by a lack of self-control and angry outbursts. Road rage is an excellent example of this. In recent years people have been killed for accidently cutting off another driver or for taking a parking place. Young people will pull out guns and shoot them at other young people over common everyday difficulties. Our fuses are very short. Though most of us will not take out a gun and shoot someone, we often open our mouths and our words are like bullets. (See blog from two days ago.)
It is only with the help of God and his Spirit living in us that we can learn the self-control that is necessary to please God and to treat our neighbors with graciousness and kindness.