Teenage runaways fall into two categories: chronic and episodic. Chronic running away is a routine power ploy that could involve substance abuse, while episodic running away involves isolated incidents in which a humiliating event, such as a pregnancy or fear of parental disapproval, triggers a teenager to flee home.
Being a passive bystander is not a "crime." If we have any hope at all of putting an end to incidents like these, we need to stop doubting the accusers and start holding rapists, abusers and bullies accountable. What we don't need to do is point fingers at those who weren't to blame for their actions.