I no more believe that that I believe people who are 22 will just sit at home drinking, or, for that matterm that people who haven't had enough sleep will sit at home and not drive.
The fact that someone might do something risky after drinking is no argument at all. If they do, it's the driving that's the problem.
Just my opinion but I think the reasons for keeping the drinking age as it is are far better than any argument I've read here for lowering it.
Unfortunately, innocent people are affected by alcohol. You may be able to sit in your dorm and have a drink and it's no big deal, but there are many teens who would not be able to handle that responsibility and other people end up paying the consequences.