Anger can make us feel powerful, but anger just for feeling good about ourselves is always wrong.
There is something strangely gratifying about allowing our angry feelings to be let loose. This is particularly the case when we “vent” after having spent a long time brooding over what we have decided is wrong in another individual.
After stuffing our frustration about whatever it is we find difficult to deal with in someone, finally letting it out unrestrainedly can feel good. Meanwhile, we convince ourselves that we are finally being truthful and that the object of our wrath needs to hear that truth, both for our sake and theirs.
But such an “anger high” is always short-lived, and almost always does more harm than good, for both us and whoever is the object of our anger.
Be not quick in your spirit to become angry, for anger lodges in the heart of fools. Ecclesiastes 7:9 (ESV)