For one thing, we don't preach. We inform, so Drs. and patients make their own decisions. 2nd, abstinence is an outdated and proven inappropriate response to opiate dependence, which is a disease of the brain. You didn't want an answer though, did you? That might mean you really don't know what the hell you are talking about.
If you did, you would know that opiate dependence is a brain disease and its complicated, which is why, after 30 or more yrs of treating pts. with the synthetic opiate, Methadone, there is no cure, only treatment. Treatment includes much more than a med, it includes a desire on the patients part to get well, support and guidance through counseling and therapy and a committment to stay away from fellow users and triggers than sent him or her back into the same state that induces use in the first place.
No, all addicts aren't the same, nor do all substances abused affect a persons body, physiology or behavior the same, so your one stop shopping "abstinence" approach is wishful thinking and a dangerously, proven naive and ignorant outlook. Rapid detox guarantees a 98% relapse rate, and the alternative is death, except in rare cases. Now that you've had a bit of an education, bright one, I suggest you study further. Don't talk about things of which you have no first hand knowledge, its irresponsible, insenstive and offensive to people who have died trying to kick one bad assed drug.