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.
“The egg hatched...” “...the egg hatched... and a hundred baby spiders came out...” (blade runner)
“Who are you?” “A friend. I'm here to prevent you from making a mistake.” “You have no idea what I'm doing here, friend.” “In specific terms, no, but I swore an oath to protect the world...” (continuum)
“It's a goal you won't understand until later. Your job is to make sure he doesn't achieve the goal.” (bsg)