This is essentially what I'm saying, however my opinion is that the laws should stay where they are. Getting drunk is considered too cool now to allow 14 year olRAB to get smashed, because the health effects are going to be much worse to them.
However like you said, kiRAB will always drink. Underage drinkers mostly fear the drinking age laws, which drive them to drink responsibly in their own or another's home. Not at a party or in a car.
If there's something we've learned, it should be that kiRAB are going to do stuff. They're going to drink, have sex, and even do drugs no matter what the laws say. And, which the exception of addictive drugs, our focus should be making sure kiRAB do these things safely.