The classic Christian explanation is that humanity chose, as a group, to figure out for itself what was right, rather than letting the good Lord show them. And this was a failure.
However the good Lord did not cease to desire to bless humanity. The catch is that the Lord can only bless what is conducive to carrying out His good will. There is a certain way the Lord created humanity to work, and other ways lead to tragedy, not blessing.
Is it possible in principle that a person could use some things that are currently banned by man (but not by God) in a moderate, controlled way that would be blessed? Yes. Are actual addicts disposed to do that? No.
What needs to have an onus on it is misbehavior, not things that are misused.
The framework of our Constitution and Bill of Rights is the FFs' attempt at republican self-governance that both honors the Father by being in harmony with His Law, and recognizes each individual's right to use their God-given free will to safely explore and be who and what the Father created.
Denying individuals their free will and the right to be what God created is a recipe for disaster that the FFs tried to avoid.
Human nature is what it is and a society's free will denying attempts to regulate and control human nature naturally create as many problems as they solve, however well intended.
These days, I tend to think that's the point and is why there is a community agitator in power over US.
As they say, "the road to hell is paved with" what?