The midrash says that anyone who has anger is as one worshipping idolatry. He loses his wisdom, health and relationships. The Torah commands us not to get into arguments, using the fight between Korach and Moshe as the model for the prohibition.
Anger is destructive and impractical - and a major sin.
Many fall into the snares of anger in a variety of situations in life. Some get angry with stranger and are sweet with those who are close. Some get angry with those who are close and are sweet with strangers. Some are sweet to every body and some are angry with everybody. It is extremely rare when anger is valid and justified, such as for self-defense against violent danger.