[ErrantX]

> but it certainly led to a reduction in obtaining-alcohol-related-crime.

As I pointed out, it's incomparable because it is a different type of crime. Prohibition of Alcohol probably would reduce the overall amount of crime in society. But it's another matter. If, on the other hand, prohibition drove individuals to other (hypothetically legal) substances which had the same affect as alcohol and were eventually as widespread then it is a comparable issue.

You can't turn around and present legalization as a way of reducing crime - because that seems very unlikely. It's better to rely on other arguments.