It's a good thing Benjamin Franklin gave up on electricity, we would've never been able to contain it safely.
It's a good thing Watts gave up the steam engine, it never would've put out as much power as a horse.
Were Shockley, Franklin, or Watts funded by the US government? To the tune of half a billion dollars?
That's not a rhetorical question - I don't know to what extent their work received grants. But I think you need to connect those particular dots to effectively make the kind of comparison you're making.
The implication of your post (sort of) is that work on mRNA vaccination development either needs to be funded by the government or it'll be given up on. If it's the kind of breakthrough that it likely is (and already has been, really) I doubt that's really the case. It's just unfortunate for Americans and the world that the work will likely be done elsewhere, perhaps more slowly, and perhaps (?) with less public (rather than for-profit) interest.