Anybody can become angry - that is easy, but to be angry with the right person and to the right degree and at the right time and for the right purpose, and in the right way - that is not within everybody's power and is not easy.
Who has not experienced anger?
Anger arises when someone or something has not fulfilled expectations, an injustice has been done, someone has attacked oneself or one's idea or property, or when things are not happening fast enough or slow enough.