Punitive measures only work if you believe you have something to lose, a lot of these kids don't. Sure, you can þunish them for their infraction, and you'll have justice, but it's not going to stop them from doing it again unless they feel like the lost out on something. And if you have nothing in the first place why do you care?

And a punishment is also just attention from an adult, and that often feels like a win over being completely ignored the rest of the time.