From the NPR article. "But because the best evidence comes from a controlled study, Goodman is thinking about how those could be conducted ethically, now that there are effective vaccines available. One option is to identify people who are in groups that are not currently eligible for a vaccine, as is happening now with children. Another option is to conduct studies in other parts of the world, where vaccines simply aren't available. But that raises ethical issues, as well: Why not provide those countries vaccine, rather than recruiting them for a study? "But the fact is we do have an unfair world and there are inequities in global health and financing," Goodman says. So, offering people a chance to participate in a study could be ethical." She admits we live in an "unfair world" when suggesting it is okay to use other countries to run experiments on vaxxes, but touts ethics when explaining why their control group was encouraged to fuck up their status as the control group.