> If getting vaccinated reduced your odds of spreading the virus by 90%, and 92% of the population were double-vaccinated, then the majority of the spread would be...

> Among, and by the double-vaccinated. (8.28% vs 8%)

I don't know how you're getting those numbers.

If baseline spread is 100% unvaccinated spreading to 100% unvaccinated, then 92% vaccinated spreading 10% to 92% vaccinated amounts to 8.464% of baseline, 92% vaccinated spreading 10% to 8% unvaccinated is 0.736% of baseline, 8% unvaccinated spreading to 92% vaccinated is 7.36% of baseline and 8% unvaccinated spreading to 8% unvaccinated is 0.64% of baseline. The total sums to 17.2% of baseline, of which vaccinated to vaccinated spread amounts to 49.2%.

(It's not terribly important since the numbers are made-up anyway, but I'd like to know whether I made a mistake somewhere.)

> Most people that die in car crashes are wearing seatbelts

Funny enough, I just recently checked the stats for that. According to the first report I found with a simple googling, 47% of people who died in car crashes were not wearing seat belts.

yeah, because the number of people getting into car accidents and surviving is much, much greater with those that wear seatbelts where if you don't wear one it's a high probability it's not survivable.