So legalize drugs and the guys who sell them will suddenly become law-abiding citizens?
Riiiiiiiight.
Of course not! Ha ha! Because, duuuuh, all the Capone-era violent gangs that were responsible for distributing alcohol during the nation's disastrous experiment with Prohibition are still controlling the alcohol business today. Yessir, there's no such thing as a law-abiding purveyor of alcohol!
Oh, wait...
It happened after Prohibition ended.
Truthfully, many would leave the life of crime because they could no longer make an easy buck. Selling drugs is easy, robbing stores is dangerous and the pay is crappy.