Even if these numbers are true (highly doubtful), do they justify government intervention in people's personal decisions? Prohibition was a disaster that lives with us to this day in the spider-web of laws that attempt to regulate what?
The statistics from the Harvard professor are very reliable. In any case, I think alcohol positives offset negatives, personally, but the key issue is: Prohibition has a good side and a bad side.
Without laws, we could sell LSD lollipops to kids. I’d call for balance, not romantic libertarian dreams or pure socialism.