There are a lot of roads to hell built on "good intentions." Alcohol prohibition was one of them. The drug war is another.
Prohibition was a reaction to a problem. It was not a good thing but before you go on a crusade to abolish all drug laws you ought to consider the motivation for the 18th Amendment.
It was an amendment to the Constitution, remember, --two-thirds both houses, three-quarters of the several states -- not just a simple law.
In fact there was little or nothing "good" about the intentions of America's 19th and early 20th century little old ladies who used the power of government alcohol prohibition as their tool to deal with their violent drunken husbands--nor should the intentions of today's modern Church Ladies and Soccer Moms ever be described as "good."
These Baptists and Busybodies are not mere well intentioned dupes tricked by knavish Bootleggers into establishing rackets for the Bootleggers to control. The prohibitionists are far greater criminals with more evil intentions than the street gangs and racketeers, because the prohibitionists commit crimes against our once sacred bills of rights.