C.C.
As much as I'm a fan of providing information openly/transparently, I see the problem here - a book that says "some teens cope by cutting...but don't do that!!" is maybe the equivalent of a book on weight loss that says "some people control appetite by smoking cigarettes...but don't do that!!" It really might put ideas into heads, insofar that it is basically suggesting that cutting "works for some people".
If you like the book otherwise, just be prepared to have a good long conversation about it (not a bad idea anyway).
Otherwise, keep looking for a good book that addresses the topics differently.