They have forgotten it and they mistakenly think that everyone else has also. Second, anger goads you to make wrong choices. That is, when a person is quick tempered, that person has the propensity or tendency to make wrong choices or to do foolish things. He lost some of his top military men because he was so angry with three Hebrew teenagers who would not bow down and worship his idol. Third, anger has negative social consequences .
Nobody enjoys being around an angry, bitter, hateful person.
They are depressing to be around. They drag you down. In fact the Bible instructs us not to be friends with an angry person. 25 Lest thou learn his ways, and get a snare to thy soul. The verse is clear, we are to avoid being friends with people who cannot control their tempers.