The AIDS risk of unprotected sex at a one-night stand is also a risk on the order of 10 micromorts and quite many people do care about it. (For values such as infection risk at 0.1% if the person has AIDS and 1% of the population having AIDS)

The real point, though, was to demonstrate how you can agree on facts but disagree on values;

But there no good reason to believe that there's agreement on facts. Plenty of people do believe that being overhygienic leads to an increase in allergies and isn't healthy.

there's a conversion from 'per year' numbers to 'per act' numbers, the issue of how much comes from food starting off bad and how much comes from food going bad, and the issue of how good you are at detecting a pathogen risk by smell/sight, and I fudged all three as coming out to 1 when combined. (

I don't think that's reasonable. It seems to me like all those factors are under 1.

The highest of the factors in the US seem to be Salmonella, Toxoplasma gondii and Listeria. All bacteria that you can kill if you cook your food. The forth factor is Norovirus and there I'm not even sure that food going back is an usual way of food getting poisoned. It's rather about uncleanness.

That's what 'overhygienic' means to me: "look at how far they're willing to go to avoid death!"

I don't think that most people who are overhygineic are that way because they follow a rational strategy but because of emotional driven fear of uncleanness.