Is there righteous anger ever?

Is there righteous anger ever? Or is there only anger? There is no good influence or bad influence, only influence, but when you are influenced by something which doesn’t suit me I call it an evil influence.
The moment you protect your family, your country, a bit of coloured rag called a flag, a belief, an idea, a dogma, the thing that you demand or that you hold, that very protection indicates anger. So can you look at anger without any explanation or justification, without saying, “I must protect my goods,” or “I was right to be angry,” or “How stupid of me to be angry”? Can you look at anger as if it were something by itself? Can you look at completely objectively, which means neither defending it nor condemning it?