Maybe you saw the article in this morning's New York Times about the move by a group of college presidents to push for a lowering of the drinking age to 18. Their point is a good one. They argue that having the drinking age at 21 has not worked, that it "has fostered a culture of clandestine binge drinking and that students’ use of fake identification has eroded their respect for the law." Anyone who has spent any time at all on a college campus knows how serious this problem is.
Megan McArdle, siding with the college presidents, repeats the common observation about the idiocy of perpetuating a situation in which someone can be sent off to war in Iraq but not allowed to buy a beer. But she then addresses the question of how to handle drunk drivers, pointing to some very sensible ideas on that.