The society didn't decide, the ruling class decided to use drug policy to attack their own citizens.
History shows that prohibition is an abject failure. The fent epidemic is symptomatic of this failed policy.
If they actually cared about the epidemic, addicts would have access to regulated, pharmaceutical grade heroin whilst also having ready access to treatment.
But then we'd have empty prisons and the police would be free to solve real crimes so we can't have that.
The war on drugs have caused immeasurable harm due to failure to understand most people use drugs either as escapism or as a tendency.
That's why it has failed.