It’s not an either/or. While we figure out the practical solutions to corruption in impoverished nations, we can /also/ do other work to improve the situation in Earth. And, in doing so, we will make solving the impoverished/corruption problem easier to fix.
We don’t have to figure out a solution to anything in other sovereign nations. Nor, can or should we really impose any functional, non-corrupt government on people who are unable or unwilling to do it themselves, unless you’re willing to go back to full-blown colonialism. The people in the country need to figure it out themselves and decide they want to have a functional government and make it happen. We can’t do it for them.
You’re conflating national building with mitigation of disease. I agree: medical aid is not a substitute for local medical infrastructure and can threaten its development. But aid is not guaranteed to do that. Also, disease is intrinsically bad.
It’s not an either/or. While we figure out the practical solutions to corruption in impoverished nations, we can /also/ do other work to improve the situation in Earth. And, in doing so, we will make solving the impoverished/corruption problem easier to fix.