Kids in Mexico can't afford a single beer, much less a case or keg. That's why they are sober and no laws are needed.
The argument can be better made that ALL alcohol should be illegal, rather than more legal by lowering the legal age.
I propose a plan whereby we raise the drinking age one year every four years. It would be like the Olympics, the Pres. election, a leap year, or the World Cup. That way, in a mere 80 years, the drinking age would be 41 and we would have gradual prohibition.
Drinking is stupid. The people that do it are stupid. It leads to rape, unwanted pregnancies, road deaths, lowered grades, spousal battery, child abuse and neglect, poor financial decisions. It makes it difficult for many people to hold down jobs, it makes people check out of society to live on the streets, it does nothing but harm and the only fucking good in the world that it does is make people feel good for a little bit. Give them an excuse to act like assholes.
What a ridiculous bullshit thing to argue for. "Hey, this shit wrecks society, BUT IT FEELS REAL NICE FOR A FEW HOURS, WOOO-HOOO! Let's get MORE PEOPLE involved!!"
Fuck that. Let's make the shit illegal. And not the way prohibition went, but the way we are attacking cigarettes with guilt-trips, bans on advertising, HUGE taxes, informative commercials, social pressure, etc...