Hi Katie,
It is important to understand how 12 step programs define addiction. The answer may suprise you. If it was strictly a morality or will power issue than most people would kick the addictions and that would be the end of it.
There are people who when they drink or drug to excess do things (as an example:have sex with anyone) that they under normal circumstances would never in a million years do. So there are a great many people who when the addiction is lifted, resume a fairly normal life that doesn't include that type of behaviour.
Unfortunately, you have people who come out in public and blame their addiction for their behaviour. In the recent US scandal. a gay congressman was found to have been propositioning teenage pages for sex. His spin doctor came out and said he was molested as a teen and was an alcoholic ergo that is why he wants to mount teenage boys. This was an ongoing problem that occured many, many times. This is a horrible distortion. It is an insult to gays and it is an insult to alcoholics. Most 52 year old gay guys who drink to excess do not go out and try to molest teenage boys.
A 12 step program approaches addiction from the standpoint that it is a problem of the mind, body and soul. Physical, mental, spiritual. When someone quits cold turkey, they may successfully conquer one area but not all three. (Maybe you know of people who have quit drinking for a month, but walk around like a miserable SOB because while they have removed the physical they are preoccupied and are unprepared to deal with the mental thoughts of not drinking. They throw up there arms and resume drinking again.). Those fortunate people who following a 12 step program and deal with the physical, mental and spiritual aspects have a better chance of long term success and more importantly a better quality of life afterward.
It's imporatnt to seperate psychological addiction and chemical dependence. Then just to confuse matters even more, there are psychological addictions which produce chemicals in the brain we find addictive such as addiction to heavy exercise and endorphine producing extreme sports. I think the worst possible scenario are chemical addictions which affect brain chemistry to produce widthdrawl symptoms which includes alcohol. The addict returns to drinking to alleviate the "feelings" produced by widthdrawl - that is the nature of addiction.
For the reasons stated above...it is very difificult for people to quit cold turkey on their own through sheer will power. A good 12 step group provides support and guidance.
Just my 2 cents