This just is not true. With proper availability people develop tolerance, and require higher doses. That does becomes high enough to become dangerous, and so they need to change to a different, stronger opiate. They develop a tolerance to that too.
Eventually they're cycling through 2 or three different opiates (sometimes at the same time) at very high dose. And their pain is not being managed.
> addicted to antipsychotics or insulin or antidepressants
No tolerance, no seeking, no preoccupation, no continuing to take them when you know they're doing you harm -- those things are not addictive.