First off, MADD is full of it if they seriously think lower drinking ages will increase deaths, accidents or assaults.  All t hey need to do is look outside of the America-box and see what the rest of the world has done before centuries.

Consuming alcohol is a legal activity which only becomes ellusive and "secret" when the adults in charge make it so.  You are specifically enticing people to go out and get completely hammered on their 21st birthday (which, if MADD would look at the records is when most of these accidents occur.  Around the age of 21, not your teens.)  In other words, when people are finally "allowed" to drink, they over do it because they are untrained and overexcited. 

As everyone has mentioned for decades, it is completely ignorant to tell people they are responsible enough to die for their country, responsible enough to vote and responsible enough to be held accountable for their crimes yet they can't have an alcoholic drink?  If your children are not responisible enough to know how to drink safely, then it is your fault for not teaching them how to.

Perhaps you could take all the funding wasted on "enforcing" a waste of a law and put it into EDUCATING your children on personal responsiblity.  Teach your daughters to keep their shirts on and teach your sons not to start fights at the bar.  It's not the alcohol that's "corrupting" teenagers and young adults.  It's the poor examples and lack of education their parents have given them.