Are you saying that pulling out in front of, and making a turn into the path of a moving vehicle is not / cannot be the cause of a vehicle collision (drunk or sober)? That occurs quite frequently, even at slow speeds. A vehicle's speed obviously affects the forces of impact, but it doesn't necessarily determine who is more at fault. If the person hadn't been intoxicated, it's arguably more likely that he/she would have waited until the moving vehicle had already passed before turning into the roadway.