There are problems with alcohol being legal. Working as a bartender has shown me how many people are drunk drivers, and how many people get violent as a result of alcohol. Alcohol is fun if used responsibly, but people need to remember that it is a drug. While banning it may remedy many problems, such as drunk drivers, certain related diseases, and perhaps domestic violence, it will cause more damage in the long run (and we have history to show for it.)
Banning the sale of alcohol just won't work.