> There is a problem of silent evidence and survivor bias here. What is important is not what they did that led to their recovery, but what they did differently (or, more generally, what was different in their circumstances) from those that tried to recover, but didn't.

That's assuming they did anything different at all. It could just be that there is not a one size fits all treatment for this problem, and part of the solution is to match the right treatment for each particular addict.