Sure some kids will die from heroin poisonings and so forth, but most won't. Most teens who use, or even abuse, drugs, do not continue doing so later in life (which is not to imply all kids who are sent to program have even experimented with drugs. Many I knew had not).
And the debate, as far as i'm concerned, has very little to do with how many kids fall into each category. In my mind it's a rights based issue, as well as a practical one. Sovereign individuals have the right to govern their own bodies and forcing people, regardless of age, into treatment, is almost always going to result in failure. Even by the AA folk wisdom you claim to cherish, a person cannot be forced to deal with a problem. They have to realize they have a problem and deal with it of their own volition. Without the desire to quite it's just not going to work, and genuine, rational, long lasting desire is not something that can be forced.