The main deterrent for JW kids was the fear of getting caught. Watch out if they think they can get away with it.
I too lived and saw other youth live a double life. We had no common sense.
When i was attempting to be physically in and raise my children "in" i always viewed most JW kids as "bad association" because i knew they would only show me what they thought i wanted to see, and then sneak around to do what they wanted.
I encouraged outside friendships with their school mates and open communication with me and limited unsupervised association with JW kids- (especially the"spiritually upstanding", good examples and Elders kids.)
Kids have to have other reasons not to do stupid stuff besides fear of punishment and making gods heart sad. Otherwise they will do it if they think they wont get caught and then say a prayer afterwards for forgiveness.
I did more stupid things with JWs than i ever did with my"Worldly"friends.