~Pub Lock-Out

Tony Tropeano is a good man with a good heart, but misguided. A city lawyer, he wants to raise the age at which one may buy a bottle of alcohol at the bottle shop to 21.
On the surface, this seems a good idea. It would discriminate against young binge-drinkers by allowing them to buy it in pubs, but preventing them from pre-drinking.
But scratch deeper, and we find it is a silly, unenforceable and ultimately useless law. Just as underage-drinkers today get their hands on alcohol, so will the 19-year-olds of the future have their big sister buy them a bottle so they can pre-drink. Besides which, I know plenty of people older than 21 who enjoy getting sloshed now and again. On the other hand, at the age of 20, I own several bottles of hard liquor (Southern Comfort, Jaegermeister, Gin etc.) which take me months to get through, one nip at a time. Am I to be prevented from making the occasional martini or black Russian because I'm not allowed to buy a bottle of Vermouth or Kaluah?