3) A limited amount of ongoing anger can be healthy and productive only when it is directed at a situation (not people); and only in-so-far-as it motivates us to put forth effort to change things for the better (in ways that accommodate the interests of everybody). For example, anyone who wants to help children and bring about a positive change to their world can be angry that children are abused (the situation). They can also dislike abusive actions very much. But once they begin directing this anger towards people (child abusers are evil), they blind themselves from an accurate, reasonable perspective of the problem, and inevitably become part of the problem themselves, rather than part of the solution. Entire volumes could be filled with the hurt and damage done to children by angry activism. Angry activists tend to be more destructive than child abusers themselves. Why is this, you ask? Because in directing their anger at people, they routinely bring more harm to an already difficult situation, creating collateral damage that harms those they presume to help. This principle applies to everything in life. Anger is a destructive emotion, and you can no more build desirable outcomes through anger than you can erect skyscrapers through dynamite.
There are few universal truths in life, but this is one of them: ongoing anger directed towards people is never a healthy and productive thing, and no good will ever be accomplished through the evil of directing anger towards others.