It doesn't matter what the efficacy rate is, cases are surging, even in the most highly vaccinated countries on the planet. Once again, you are trying to say, "Yeah, but how many cases would there be if we didn't have the vaccines"?
Here is the 2021 Covid chart for Israel, the world's most highly vaccinated country:
Israel COVID-19 stats - Realtime coronavirus statistics with charts
You can see cases surging after 80% were fully vaccinated.
Let's say, for the sake of Argument, that the efficacy rate of the Pfizer vaccine is 42%. At a supposed 42% efficacy rate Israel's number of infected rose from near zero on July 1st to over 1 million less than 2 months later and that is with the highest number of vaccinated in the world. Your argument seems to be that, "Yeah, but there would be over 2 million infected but for the efficacy rate of the vaccines. That's the best you can argue? As I said, no one really knows the true efficacy rate and it really doesn't matter because no matter what you say, the number of infected in the world's most vaccinated country has risen from close to zero to over one million people during the time that 80% were fully vaccinated. We need to quit pretending that the vaccinated are not spreading Delta because they are and they are A LOT.
So, as I have been saying all along, we can learn two things from the Israeli graph:
1. The vaccines aren't doing diddly at stopping the spread of Delta because even the vaccinated are spreading Delta
2. The vaccines are extremely effective at cutting down hospitalizations and deaths.
So, trick question here:
If the US could get our vaccination up to the world's best at 80%, what would be the result of that?
Answer, our cases would still be surging