Needle Exchange and Christian Ethics

There has been a resurgence of interest in the harm reduction program of Needle Exchange. The basic philosophy behind the program is that if drug users will swap out their used needles for clean ones then there may be a decrease in the spread of both HIV and Hepatatis C. The problem with the program is that it does turn a blind eye toward drug abuse and even enables abuse and addiction. So as a Christian what do you think is the right response to such a program? Do you think Christians should support it or reject it?