First of all, governments already do fund all the research.

Even in your hypothetical, thats just one government. It doesn’t stop medical advancement entirely just because one dictatorship stops funding research. It moves elsewhere. When nazi germany declared that nobody would receive funding for anything outside of Aryan research ^tm the scientists just left to a country that wasn’t barbarically stupid.

Also, everything in your final paragraph is stuff that is happening now, in america, under the capitalist organization of the economy which gives all the rights to a private company after publicly funding the research and development of their drugs. It makes no difference, save the fact that now the authoritarian government in power has consolidated billions of dollars for rich capitalists who will gladly accept the orders to no longer produce those medicines while remaining disgustingly wealthy.

Even if you believe in the delusional idea that private companies are funding the development of novel treatments entirely on their own the fact remains that drugs are currently, as we speak, not for all people. I am pointing out the solution to that problem, and the response was to point out how, if we did what I said, then what’s already happening now would be the consequence.