Good god you have read nothing in this thread. Have you been ignoring all of the great posts regarding the reality of what actually happens in this country? People under 21 in this country drink anyway right? YES they do lol. So, what happens because their drinking is illegal? They drink in places where they wont get caught. What happens in these places? Well, they drink a lot more because finding these opportunities is rarer. Is there anyone who will stop them from consuming too much or cut them off when they are clearly drunken over their limit? NO. IS there anyone who will stop them from driving home? NO.
So, if drinking at 18 is legalized, will at least some of the drinking happen at public drinking establishments? Yes. Will this drinking be regulated? Yes. So, could there potentially be fewer accidents? Yes.
I think that rather than making the "Should we lower the drinking age?" question a yes, or no question, we have to think about it a little harder. That is because it isn't a yes or no question. There is no simple solution, but there are still accidents involving underage drinking, so there must be a better solution. Simply saying no, will get us nowhere.
We should teach kids more about drinking. Allow them to drink responsibly in public places. Maybe regulate what type of liquor they drink. Regulate where they drink. Allow for more school sponsored drinking events, where kids can only drink certain amounts and in places where their car keys will be taken. Either way their is probably a better answer then just teaching kids to abstain.