Unfortunately, this is not the case. You still are conscious of your decisions when you walk into a bar and fire randomly. There is a reason its considered rape if you have sex with someone who is intoxicated; they can no longer provide consent. The no longer have the ability to reason for themselves.
Are we going to argue that you're a murder if you drink to excess while your keys are still in your pocket? Because that's when the decision was made, not when you get in your car drunk. At that point, its not you making the decision.
