There is not always a cost to society of any individual getting buzzed etc. That is silly. Or anyone having a drink on the weekend for pleasure is some risk, but of course that's silly. But there IS always a risk with readily availability (of alcohol lets say) that SOME PERCENTAGE of the population will not be able to handle it and will be susceptible to abuse (saying drinking and driving) and/or addiction and/or other risks. But prohibition doesn't seem to do all that much to change that and adds problems of it's own.

