The counterargument is that if drugs are legalized then the crime syndicates will need to find a new line of work. It's possible they'll go "legit" like the mob did after prohibition and get into the Casino business, but it's also possible they'll switch to human trafficking or gun running or some other harmful trade.
This is an especially big danger if you're talking about a gang that currently deals mostly drugs but also smuggles forced prostitutes over borders on the side. Take away the drugs and they're likely to expand the side business.
This is an especially big danger if you're talking about a gang that currently deals mostly drugs but also smuggles forced prostitutes over borders on the side. Take away the drugs and they're likely to expand the side business.