And you know this for a fact because you know that the murder rates during the Prohibition, and subsequently during the War On Some Drugs, were a lot lower than before or after these completely excellent experiments in social engineering? Or do you have some other fact(s) at your disposal?
I suspect (no I know for a fact without being told) that you are a goofy libertarian. How do I know this? Because you are clearly so obsessed with drugs and the issue of drug legality that you make up arguments for me.
Notice that my point was about supposed effect of "remov[ing] drugs and alcohol from society," not how that would be accomplished. But since you asked, it is a fact that the murder rate did not go up appreciably during Prohibition, that use of alcohol was not illegal during prohibition, and that a disproportionate number of all murders during prohibition were , in fact, related to alcohol. Furthermore, there is a direct correlation between the explosion of the murder rate in the last quarter of the 20th Century and the mainstream recreational use of mind altering drugs other than alcohol. All of this information is readily available on the web.