Anger has a bad reputation. I believe this is unjustified. Anger conveys an important message or information about the fact that there is something wrong or something unfair.
Neither acting out anger nor pushing it aside will ever resolve it.
Understanding what is behind the anger is good, but not sufficient - like the understanding of all emotions, in general, helps little and may even distract from the actual work that has to happen.
Processing anger by using adequate techniques will not only resolve the anger but also reveal a new layer of one's Emotional Structure. This process comes with the bonus of the occasional cognitive revelation as well.