You're not wrong, but addiction is not a certain outcome. Most people who use a substance that can lead to addiction don't become addicted. The question is why can two people, for example, abuse alcohol for a period of their youth, but both don't become addicts?

We need to look at this holistically. Overprescribing is a problem, but we shouldn't be needlessly afraid of these substances. Personally I've been prescribed these medications, I took some and when it stopped hurting I stopped taking them and the bottle sat in my medical cabinet in case I injured myself later. Eventually it expired and I threw it away. It wasn't an issue of will power or anything like that. I just didn't feel the compulsion. I'm the same way with alcohol and other drugs. I enjoy it when appropriate, but I feel no compulsion whatsoever. I, in fact, prefer mental clarity.

But I have people in my life who develop very strong compulsions and become addicted to anything that distracts them from their psychological torments. Reducing access helps, but reducing other circumstances in their life that they may feel the need to numb has to be part of the solution.