At first reading these sentiments felt like I had stepped into some sort of horrible satire, but now I'm starting to think that maybe this is just how it is. Does the average US citizen really think this way?
If by average you mean approximately 50% then yes.
I guess I'm outing myself as an American here, but what exactly are you referring to by "this way", and what part of the thinking in question is distorted/inaccurate?
How could it possibly be otherwise. If you have a bunch of drugs that are made profitable, net of r&d costs, only because of the American market, then these would never get invested in without American spending in. And remember, you can’t go pointing to single examples because you also need to consider all the funds that go into funding drugs that don’t pass clinical trials.