I'm afraid I do not follow...

1. 21.2% of the population (unvaccinated people older than 12) make up 40% of the hospitalizations. It's even more stark when you remove the immune compromised from the statistic.

2. For the delta-variant we need a higher vaccination rate to reach herd immunity. Estimates vary, but most put this around 85%.

3. While vaccinated people still can get sick (and why won't they, the immune system can only start to act after encountering the pathogen), but... the time of being infectious is lower and (see above) hospitalization and death rates are much lower.

Upon (very basic) scrutiny the numbers from Israel point to the high efficiency of the vaccines not the opposite.

And last, what would have us do instead?