Ye have heard that it was said by them of old time, Thou shalt not kill; and whosoever shall kill shall be in danger of the judgment: But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but whosoever shall say, Thou fool, shall be in danger of hell fire.footnote "d" in verse 22.) It is interesting to me that this injunction denotes a condemnation of anger "without a cause" - not anger in and of itself. It would be very easy to justify anger in general whenever we feel we have "a cause" - when our anger is caused by another. However, these verses appear to be addressing the type of anger that leads to contempt, derision and insults - not the type of anger that leads to defense of others or "righteous indignation".
My resolution, therefore, is NOT to avoid anger in and of itself, but to avoid or control anger that is not justified by a legitimate cause, as well as to control the effects of anger. In other words, even if there is a just cause of anger, I still need to focus on not letting that cause lead me to contempt, derision and insults toward the person who caused the anger.
I have a sneaking suspicion that I will find through my efforts to control the results of anger that I will begin to recognize those times when anger is a legitimate feeling and when it truly is a response "without a cause". I also suspect this focus will help me focus any "righteous anger" on the actual "cause" - not the person behind the cause. At least, that's my hope.