Honestly, I don't think this is captured in "the sources". Keep in mind you're dealing with a culture here, much like with policing issues.

Doctors don't hold each other accountable, and assume that if there's an issue with a patient, it's the patient's fault; they're being unreasonable, and some poor doctor must be putting up with their bullshit.

Then you have the very real truth that addicts don't always make the best patients. Further they tie up an inordinate amount of medical resources. It doesn't just stop and end there. Medical abuse is rampant, in any case, and with several other conditions, why would they leave drug addicts out? There's an environment of hostility from both sides - addicts who are fed up with treatment from doctors, and doctors angry with addicts; the fighting can cause a feedback loop.

Doctors are some of the most anti-addict people on the face of the earth. If you took a blind poll of doctors and got their true thoughts, I think a shocking number would be in favor of euthanasia via medical inaction. They are not trustworthy on these issues. Believe it or not experiencing the worst of society, often through bigoted and stereotypical lens, does not make someone a rational decision maker. You're more likely to find bitter, angry hotheads that just want to punish the bad people they've come to hate.

Getting back to "the sources" here, there really aren't great sources, because no one reporting has a motive to talk about this. You will see some quiet conversations, but they don't go far. Doctors are respected and addicts aren't. Medical policy is written by medical workers (the ones I'm criticizing). IMO the media isn't great at holding doctors accountable. They're getting better with police, but they used to be horrible there too.

Media, government, doctors, and insurance companies are way more of one team than people realize. With police we only heard stories for the longest time. Some of them seemed like conspiracy theories, but the number and magnitude of these interactions mount. This is true here, too. People are getting abused by their doctors. If you ask around you'll hear stories.

If you talk to drug addicts, who've had experience with doctors, and shockingly, even people with very moderate use (even one time!), you'll hear the truth: You are dealing with a temperamental, sketchy piece of work that's also a powerful bureaucrat that will take your different lifestyle as carte blanche to refuse to treat you and ignore your medical issues... and it doesn't even matter if you quit!

Just talk to someone that's gone through the system. You will hear conflicting reports, just like a huge percentage of people never have bad interaction with police, but there's a lot of people out there that know exactly what I'm talking about. There's sides of society not everyone sees.

Think about how bad you sound speaking up and there's massive chance you sound even worse in the story.