Legalize it and let the meth heads kill themselves off. Then the cooks will have no customers. At least I'll be able to limit the symptoms of my fucking cold without feeling like a criminal.
If you did any research on this problem you'd realize that it isn't nearly this simple. You're argument boils down to the classic, "If they are only hurting themselves, why do I care?"
But, that isn't the case. Because of the way meth is made, when it goes wrong, shit explodes, and/or the rooms are filled with dangerous chemicals that require specialized training, time, and money to repair. In small towns, where meth gets popular, local sherrifs simply don't have the time/man power/and budget to deal with the aftermath of shutting down meth labs. Best case there are in the middle of no where, but, we also find them in hotel/motel rooms ( mobile, hard to trace).