Huh? The Alcohol Black Market was neutralized, and indeed went away. With it went control of that Black Market by organised crime, the lucrative profits from bootleg booze, and the turf wars over alcohol.
What we have today is an unprecedented profit motive in the illegal-drug Black Market. Organized crime thrives on Black Markets - do you not recognize that empirical fact?
Still want to promise us utopia if only we would legalize all drugs?
I am not neccessarily for that extreme measure. Apparently your utopia includes having some drugs illegal-yet-readily-available 24/7 in every city and town across the USA - including to minors.
Having grown up next door to a Mafia soldier, I can assure you that the black market for alcohol never disappeared. It's alive and thriving.
You'd have us believe this would happen -- just legalize drugs and organized crime will go away. Why else do you bring it up?