There are many parents and guardians struggling with teens and inappropriate conduct. Good parents; bad parents; parents new to sobriety struggling with their own issues while they genuinely want to make positive change; parents who don't want to be parents. Wealthy lifestyles and trailer park, every socioeconomic group. Not uncommon for teens to be running away from an unhealthy home life and unintentionally finding themselves in risky situations instead of rescue, getting caught up in bad stuff without meaning to.
There are few resources. Where does one go? What does one do? What's the safety net? For a parent AND a teen. Particularly with 15-17 yo teens -- not old enough to access services independently (like Covenant House) but not young enough to be a priority for law enforcement and Child Protective Services. 
Family counseling costs money and there are a ton of barriers. Even when parents try, you can't make a teen go. What do we do? How do we address this?