I would venture to say that most endangered teens were "at risk" (one who is less likely to transition into adulthood successfully) long before they received their latest classification of being endangered (under circumstances that indicate they may be in danger) .
Endangered could be for medical reason and apply to the elderly as well but from having worked with trouble youth many years ago, their behavior is often a reflection of something being dis-functional in their environment. Not always (to give leeway to those youth who are just wire wrong from the start).
But if you have or know of a rebellious child, a long, hard look at their environment usually clarifies the picture. Regrettably that does not happen until after the fact. It may not be physical abuse or intentional. I have seen it with some very affluent families who are "too busy", or too disconnected from what is going on in the the children's life.
I know some eyes will roll, but it could also be from a lack of discipline or strong family values. Anything extreme can cause its' own issues and there is no sure-fired plan, but being involved, disciplined, compassionate and consistent always seems to get good results.
What can we do as a community, as teachers, family friends or concerned bystanders? Or should we?