Well, it's not just about people doing the right thing. The experts have failed us too: the J&J pause, the reluctance to be frank about the myocarditis risk in mRNA vaccines, the failure to acknowledge or study in depth natural immunity, the waffling on pregnant women, the failure to take seriously the complaints re women's cycles, the mixed messaging about whether vaccines work, the failure to reach out and empathize with minority communities, the prior lies with make people skeptical of the authorities ("masks are better than vaccines", the flip flop on masks, 2 weeks to slow the spread), the fact that Pfizer is the only option available for the under 18, the politicking on boosters and now Biden's EO which will just cause the die hards to dig in their heels and conservatives concerned with the Constitution to sympathize with them. Frankly, given the US skepticism towards authority, and the track record of the experts, I'm frankly surprised to see it as high as it is.
I agree with the approach not looking at a blanket number for the US. I think we also can't look at it at a blanket by age group (and some of those 40-65 which are still somewhat vulnerable have not vaxxed). I think looking at the rates for 20s and unders isn't as useful (at least not with current variants). I think this also leads to the conclusion that places like San Francisco (with high compliance) or Los Angeles and NYC (with a combination of compliance and natural immunity) are also the most over the top with their regulations where they do the least good.