So that means we do not try? For example murder has never stopped since Cain slew Abel. Does that mean we repeal laws and stop prosecution of murders? Genius!
Prosecution of murders is not about stopping murders though, is it?
The purpose of the death penalty is not to create a deterrent for others, is it?
The purpose of the death penalty for murder is simply punishment. Retribution. Justice. Vengeance.
Do you think that the correct course of action to take with an addict is to punish them? Do they need retribution? Justice? Vengeance?
Do you think putting them in cages with hardened criminals is going to stop their addiction?
If you are going to try to save someone, then perhaps you may consider trying something that has a chance at working, instead of trying something that obviously does not work, and then saying oh well at least we are trying.
Because the truth of the matter is you’re not trying.