Yeah, I guess the equation was misapplied there. The point was that the statistics won't (or might not) chalk the death up to alcohol like they should, which I'd say is a harmfully misleading omission; even if it's not a longevity problem for the drunk driver, it is for the other person.
My roommate recently sent me a review article that LW might find interesting:
Personal observation says that LWers tend not to drink very much or often. Perhaps that should change, to the degree suggested by the article?
Full article here.