I disagree that most of them want to quit.
On what authority? Ask them. They will say they wish they weren't addicted to drugs.
It is a physical disease. Your choices and behaviors are not the result of some magical soul or divine agency. An opioid addict needs opioids the way you need oxygen. To what extremes would you go to get oxygen, if someone put a bag over your head?
Diseases require some form of treatment. And no, simply denying use for a while doesn't cure anyone. The addiction will always be there. Those that escape it will say, nearly to a man, that they still battle it every day.
I disagree that most of them want to stop doing drugs.
Yes, you said that. But you only kinda, sorta "feel" that is true. However, the data shows it is not.
For instance, look at data on those addicted to smoking. When asked, the vast majority will say they wish they could quit.
The data also shows we get different answers to the question, depending on time of last usage, regarding opioid addicts. That is clear, hard evidence of what the physical disease does to their brains.