Well, a) doesn't mean he's an alcoholic, a lot of people do stupid shit like that, though most of them tend to be a bit younger when they do, and b) it's not like alcoholics (or addicts of any kind) have much of a say in the matter.
Except to go to AA.
If it were that easy I wonder why there still are alcoholics. And it's not because they don't want to stop, 99% of all addicts come to that point and that's the problem with addiction. You think "I have to stop, this is killing me, I know it! I need help! ...just one more.".
Who said it was easy?