Same element as is a factor with reduced criminal activity -
they don’t know who’s armed and who’s not.
I’m not sure about their “rules”, but I think they actually have to kill someone other than themselves in their act of jihad to be assured of paradise.
Of course, widely spreading the rumor that CCHL people store their ammo with a light coating of bacon grease would go a long way toward deterring sudden jihad syndrome.
I think as long as they were trying it counts. I recall a couple cases or murdered Arabs, looked like Jews, which the terrorists simply wrote off explaining the victim had become a martyr, a wonderful thing.