TM; I don't carry while on NW...but of course, I don't live in Z's neighborhood. Perhaps if I did I may carry..but I doubt it. Our neighborhood is simply a small, rural hamlet...but we have a very nice town park. For a while we had some unsavory types hanging around there, who showed signs of being drug users/dealers. Just one time we called in on a carload and they were busted with the goods.
Where Z made his mistake(IMO) is patrolling alone; a second person with presence and/or phone/camera helps.. but perhaps all others in Z's neighborhood were lazy or afraid, depending upon the residents.
Another thing I would like to see all NW groups take on is wearing visible identification, such as our caps. Not only would this allay fears a youth may have with someone "following" them, but may add assurance for elderly when a NW person is nearby after dark. Also, if someone with a "chip" decides to confront a NW patrol..the jury would know that the aggressor knew full well who he was attacking.
No, I don't carry, but if I had many burglaries and such confrontations as this..I may. I do carry one of my hand forged walking sticks..which could be very effective, whether used club or spear wise... Things have calmed down to a point where patrols are only sporadic..and unfortunately solo..
Always keep in mind..Watch dogs...not Attack dogs !
Below, see NW cap and forged head walking sticks;