One of the key traits of the alcoholic is that, he/she cannot keep from drinking. They will come up with some form of execuse for why they started their last drinking spree, if you ask them after their last debacle. This is the blind spot that we have to focus on. Some people know that if they drink next time they will lose their family, house, car would still drink because of the obsession. The consequences don't deter them from drinking. Thats why the book says the alcoholic does not have a defence against the first drink. The defense comes by working the steps. The person has a psychic change.