I would go even further and say that anger is healthy whenever the alternative is something worse, like depression. Anger isn't a state we want to normalize, but as a momentary response to what we should not happily tolerate, it is something that naturally arises for a reason. Learning to be with our anger without acting it out is a big part of maturity. We have the right to feel whatever we feel, but that doesn't give us the right to take it out on others. The confusion comes when people think that feeling it is the same thing as expressing it in a way that makes it someone else's problem. Personal responsibility and healthy emotional responsiveness, including anger, is the combo we all need.