There's a difference between "sheer willpower" and "wanting to change and putting in effort toward habit breaking strategies". There's quite a lot of knowledge about habit forming and breaking, and one of the key strategies is to set up measures so that you don't have to rely on willpower during the key moments when you're being tested.
People need to have the "willpower" and commitment to change themselves, that is different from expecting them to not do drugs when they're in withdrawal and holding the drugs in their hands.
This is why there are things like gambling blacklists, where gambling addicts can register themselves so that they can't relapse in a moment of weakness. They need the willpower to register themselves so that they don't have to rely on the willpower to not go into a casino when they pass by.
People need to have the "willpower" and commitment to change themselves, that is different from expecting them to not do drugs when they're in withdrawal and holding the drugs in their hands.
This is why there are things like gambling blacklists, where gambling addicts can register themselves so that they can't relapse in a moment of weakness. They need the willpower to register themselves so that they don't have to rely on the willpower to not go into a casino when they pass by.