It's always been about blaming drug cartels, smugglers, distributors etc. Drug possession is the crime, drug use is the crime, drug supply is the crime.
The theory seems to be that if only drugs were not available, people would not use them.
All evidence points the other way. Drugs satisfy, but do not create [1] the need. In the absence of illicit drugs alcohol, prescription meds etc flourish.
It seems to me that there's a missing understanding of why people want to take drugs. Is it just addiction? (If so, why not spend those billions on addiction relief?) Is it boredom? Desperation? Something else?
To win the "war on drugs" its important to understand "demand" not just supply. Without demand supply is meaningless. Whereas Cutting supply means nothing. All you do is promote other suppliers, other ways to achieve the same effect.
I'm not against policing the borders for drugs. But watching "border patrol", and seeing endless (justifiably) self-satisfied officers finding drugs, wondering "so what?". Clearly drugs are freely available (despite this bust). Clearly demand is unabated.
To me the key question at the heart of yhe war seems completely unmentioned;
"Why are people using drugs?"
[1] yes, I'm aware not all drugs are the same. Once hooked on heroin you need more heroin. This doesn't negate my root point.