During my life time I've watched American society deteriorate at an increasing pace and the willing of a large segment of the population to drug themselves endlessly and the willingness of others to defend it is but one example of a widespread moral decline.
The so-called War on Drugs was/is an attempt to curb supply not appetites.
The War On Drugs has not demonstrably curbed any appetites - but it has hyperinflated drug profits and channeled those profits into criminal and terrorist hands.
The same could be said of the laws against child pornography, etc.
I'd be interested to know what your "etc." is. As a rule, laws against real crimes with actual victims are far more successful than laws against victimless "crimes" - because victims and their loved ones avoid or resist the crime beforehand, and cooperate with law enforcement and prosecution afterward.
Lamentably, this is less true of crimes against children - but despite the difficulties, in those cases there remain real unwilling victims that must be protected ... whereas the only "victim" of drug buying/using is the willing buyer/user.
The so-called War on Drugs was/is an attempt to curb supply not appetites.
It has not demonstrably curbed supply either - but, again, it has hyperinflated drug profits and channeled those profits into criminal and terrorist hands.