Success is relative. The recovery programs that have sprung up from the ideals of Alcoholic Anonymous are not perfect, but the US Government has done very little to actually support those with substance issues. Quantitatively AA and NA are far more successful than all the money we throw at drug enforcement, and our drug enforcement policies actually harm the programs and the users, i.e. mandatory AA attendance in response to alcohol related offences and the danger to an NA individual's recovery when they do fall off the wagon and are picked up by law enforcement.

I've seen the local success rate for AA, and I imagine that the NA programs are worse, but they are better than the alternatives we, the United States, present them.