Your last sentence is the part that gets me the most- you don't have to be sloppy and slurring drunk to be dangerous behind the wheel of a car. Frankly, if legislators want to prosecute bartenders for over serving patrons and hold them accountable for whatever the patrons go on to do in their drunken state, they should just ban alcohol outright. I can't think of any other scenario in which we hold someone legally accountable for another adult's consensual actions outside of committing a crime.