There are laws on the books already that deal w/ the irresponsible use of alcohol (DUI, public intox, selling to children, etc.), & NONE of us who advotcate the re-legalization of marijuana believe that those laws should be changed.
As a matter of fact, this pot-smoking advocate believes that the laws for DUI should be strengthened, & include the death penalty if an innocent person is killed by a DUI driver....but that's just me.
I am simply countering the argument about beer drinkers not breaking into homes - that cuts both ways, and akin to you said, breaking into a house is also illegal now. And I do agree that pot should be at least decriminalized if not legalized, my disagreement is with legalizing hard drugs.