I'm of the mind, that YES! If you can fight for this country, smoke, gamble, vote, and any other number of adult things, then YES, you can drink.
I agree 1000% with the heads of colleges, that lowering the drinking age WILL bring those issues into the open and they can more easily deal with it.
Also, if kids are drinking at 18, and more than likely still at home with mom and dad, the parents will be able to take more of a hand in it.
I'm not that far from 18, and certainly closer to 21, kids will do what they want. It's time we stop trying to shovel the problem under the rug and address excessive drinking in the open by first making it legal, which will make it easier to talk about it without fear of ramifications, and having kids drink WITH adults and not just with other underage kids!