It is undeniable that a rehabilitation program may fail, and woefully at some extreme cases. The truth is that rehabilitation program works differently for different people, though authorities are often afraid to make this data public because it may discourage other alcoholics and drug addicts from seeking help in a rehab center.
However, the percentage of failures is very minimal and often negligible – if you prefer to put it that way – but it has not stopped liars and probably those who feels threatened that they would be put out of business if every alcohol addict should voluntarily arise and seek for help. Hence, they balloon this figure and try to convince people that rehab programs can do little to get those alcoholics sober – which by the way is all they try to do.