The way I took it is:
You are one of the few people who don't challange him for his obviously abhorent conduct here. When YOU asked him why he did that (give out the PW/CW), in any way that he responded to you, he could not have justified it with out getting a negative reply from you. You'll notice that was his last post. He therefore realized that he would have lost one more person who nomally remains neutral. All he had to do was "drop out" for a while and it'll blow over with out him ever having a confrontation with you. See how that works? As long as there is division here in how to treat him or lack of any objection to his conduct, he will continue to disrupt this Newsgroup. Ignoring him is enabling him to continue.
You'll notice the calm and that the discussions taking place now, are right in line with what you always thought they should be. And why not? It's always that way with out him.