We're getting into the realm of Trolly Problem-esque ethical thought experiments, but how many drunk pedestrians should be allowed to die to save one victim of drunk driving? Consider also that those dead pedestrians are often not really at fault, but just unable to avoid a bad driver due to poor reaction times that would also affect children and elderly pedestrians.

I'm not saying that driving drunk is ever morally acceptable, of course. There are just some interesting unintended consequences of public policy at play.