Drugs don't kill other people? What world do you live in? Murder is not committed by drug addled addicts trying to get more money for more drugs? Drug Gangs don't murder members of other gangs and innocent bystanders all the time.
Those are effects of drugs being illegal, not of drugs.
Not to mention car accidents, work accidents and other ways drugged people KILL other people.
Alcohol is a FAR greater risk than drugs are in this regard.