This. I always love pointing out that pharmaceutical opioids are, for all intents and purposes, unavailable across vast swaths of the world. In much of the developing and post-communist worlds, heavy bureaucracy, capricious enforcement of drug laws by corrupt government officials, and the threat of being exploited by the criminal fringe are enough to intimidate most pharmacists and healthcare providers from even daring to stock opioids. And for those who do, the costs of legally procuring them and protecting them from diversion means that only the privileged classes can afford them. I'd venture a guess that the vast majority of humanity is perfectly used to thinking of pain as something you grit your teeth and bear, no matter how intense it is. I'd guess most can't imagine any other way, and would find it odd that some people feel entitled to drugs that take pain away.
I wonder if maybe most people in developing countries without ready access to opiates tend to rely on natural sources of endogenous endorphin production to deal with physical pain: hugging and other forms of close human contact, limited amounts of labor and physical exertion, comfort food, humor, religion, and shared communal beliefs that make one feel like a member of an exclusive club. I also wonder if people in developed countries who've gotten used to the ready availability of pharmaceutical opioids have at the same time, inadvertently, forsaken many of these natural sources of endogenous "feel good" brain chemicals, or have built societies that don't promote them for most people.
I'm speculating here, and could be way off base. But what I do know for sure is that most humans who've ever lived have dealt with a world full of physical pain with no exogenous opiates whatsoever. Keep in mind also that what I state here is descriptive, not proscriptive. That is, I'm simply stating what was and is, not necessarily what should be. I just think a statement that implies easy access to opioid painkillers is a fundamental human right needs to be put in perspective as the radical and novel idea it is.