Although the general principle of controlling anger is a good one, and although it's one of JWs' strengths when in large gatherings to be patient, peaceful and 'sheeplike' in unusually trying situations (whatever the sociological/psychological reasons are), the article was a little one-sided at times - condemning the 'world' while promoting the fluffy-bunniness of their chosen 'good' Bible examples.
5 Further, many of the people we come in contact with are "lovers of themselves," "haughty," and even "fierce." It is very easy for bad characteristics like these to rub off on us and anger us. (2 Tim. 3:2-5) In fact, movies and TV programs often portray vengeance as noble and violence as a natural and justifiable solution to problems. Typical story lines lead viewers to look forward to the moment when the villain "gets what he deserves" - usually a violent end at the hands of the story's hero.
6 Such propaganda promotes, not God's ways, but "the spirit of the world" and of its angry ruler, Satan. (1 Cor. 2:12; Eph. 2:2; Rev. 12:12) That spirit caters to the imperfect flesh and is in total opposition to God's holy spirit and its fruitage. Indeed, a fundamental teaching of Christianity is not to retaliate under provocation. (Read Matthew 5:39, 44, 45.)
It is a universal theme across times and cultures - a gross injustice has been done and the good guy overcomes the greatest of odds against him to dish out 'just desserts' to the bad guy. Surely, the OT has many examples of God-fearing people seeking vengeance to repay acts of evil. In fact, isn't it one of the basic themes of 'God's inspired word' - the seed of the woman who was bruised in the heel will, in retribution, bruise (crush) the serpent in the head?
9 It was quite different with King David. He had numerous opportunities to take revenge, but he did not. (1 Sam. 24:3-7)
Sure, he had opportunity to do harm to King Saul a couple of times and chose not to, and as the article goes on to say, he narrowly escaped bloodguilt with respect to Nabal - only because Abigail intervened. But what about David's 'godfather'-like revenge on Joab and Shimei executed through Solomon? (See 1 Kings 2:5-9 forwards.) Why was that omitted?