There’s a trade-off, cost-benefit analysys. If a disease is so catastrophic that it kills everyone fast, well you’re not gonna make profit off them ever, because they die. Cure this one.
What about diseases that can be controlled somewhat, and only affect small amounts of the population? What if for them to stay alive they have to stay on a regular concoction of expensive pharmaceuticals either forever or for a long time? And they can still go to work? Why cure this, out of altruism? That’s not how capitalism works.
Let’s just say, for shits and giggles, we could cure immediately the common cold and mild influenza, forever. No more cough and cold over the counter medicine needed, much less pain and fever reducers. Local pharmacies don’t need to stock this stuff anymore. The companies that produce and sell these are all tied to wallstreet. Getting colds doesn’t stop you from working (or buying/consuming). Shit, I work with “men” who are “tough” who never call out of work sick because “I’m not a pussy” (cultural hardwork ethic propaganda nonsense).