IT was a day of shame for the Bushes, an incident made all the more embarrassing by the family’s previous well-publicized difficulties with alcohol. I refer, of course, to the regrettable 1997 decision by then-governor George W Bush to approve legislation further toughening the penalties for underage drinking. In Texas, the legal drinking age is 21. A typical Texan of 19—let’s call her “Jenna”— is judged to be responsible enough to vote, drive, marry, serve in the military, and (this is Texas) be executed, but she is not, apparently, sufficiently mature to decide for herself whether to buy a margarita. [...]