Because all those years of AA did not do anything to change his thinking.
Not only that, AA's way of doing things make a person feel like a failure if they slip up. Counting years is like waiting for some big even going to happen.
No, if you want to give up drinking you start out with the frame of mind I am a non-drinker and I do not need alcohol to help me in life. I can do fine with out it. There and from that point on you are a non-drinker. You never have to fear the idea of being addicted to alcohol again. All you have to do is change your thinking towards alcohol.
AA just because you are always thinking "I am one drink away from being a drunk." I am an alcoholic but I have been sober of 20 years. If after 20 years one is still living in fear of alcohol, then it is not alcohol that is the problem. It is the mindset of the individual. You would think after 20 years a person has learned to have fun and enjoy life fully and honestly with out alcohol. Yet if some one is thinking "I am an alcoholic" they have not begun to move on.
Alcohol is like most other substance addictions. Once you realize that most of it is mental, and that your thinking about it is wrong(and so is everyone else's even those so called "non-alcoholics". If you think about it, if you can not have a good time with out alcohol you are dependent on it. Just to varying degree that is all). I feel that AA is looking at things wrong. You live in fear of doing something you will regret doing. If you live like that, it is only a matter of time before you slip up.
Do not be afraid of failing, just remember that it is your thinking that is wrong. 20 years sober is the wrong mentality. I gave up drinking and enjoy my life fully, is a much better way to be thinking. IMO.
I would much rather live in total confindence and security, not run and hide and be afraid of a problem. If you have total confindence you do not need to avoid places where drinking will take place(although you will realize how boring such places really are). If you are avoiding, you are actually saying you are not over your fears or dependency.
I could go on.
Just get Allen Carr's Easy Way to Stop Drinking, you can get it on the net second hand, or at book stores. Read that book and see what happens.