Should the drinking age be lowered to 18 or 19? Yes (with qualifications, see below).
Should greeks spearhead a movement to do so? No.
The 21yo drinking age draws a line right through the middle of college communities and other groups of young adults. In many places you can't even get into a bar unless you're 21+, so if even one person in the group is under 21, you either have to change your plans or exclude that person.
The 21yo drinking age is also very difficult to enforce. I had several friends in college who would buy for me, and even though people were carded at the entrances to parties, bartenders routinely ignored the absent bracelet or the big black X on your hand.
I'd say the 21yo drinking age contributes to 18-20yos overindulging. The temptation is definitely there: "Woohoo, I got in and I wasn't carded! Might as well take advantage." And what's the first thing most of us did when we turned 21? Went out to a bar and got $h!tfaced.
I would like to see a graduated drinking age, maybe 18 for beer and wine and 21 for hard liquor, or 18 for 3.2 beer and 21 for everything else. The 18-20yos can go to a bar with their older friends and have something to drink rather than be excluded, and they can gradually get accustomed to what alcohol can do to your body and your judgement. It would be a PITA to enforce, though...
The greek community shouldn't be spearheading this effort, though. We are already associated with alcohol and the negative aspects of alcohol use.
It wouldn't be inappropriate for greeks to spearhead a "get out the vote" campaign, though, and if a referendum about a lower drinking age happens to be on the ballot, oh well
