That clearly illustrates why the debate never goes anywhere.
People who are pro-drug-war argue from the perspective that any change from the status quo must be carefully justified. (unless it involves banning new drugs by adding them to the DEA's drug schedule... in which case, full speed ahead!)
People who are pro-legalization argue from the perspective that drug-neutral laws should be the theoretical starting point, and drug bans must be thoroughly justified.
"Want to keep guns out of the hands of felons? Make fewer felons in the first place." --Vanya
"God doesn't make the world this way. We do." --Rorschach, Watchmen
"You should know that if you don't do this thing, you won't be in any shape to walk out of here." "Would that be physically, or just a mental state?" --Miller's Crossing