But how can you take issue with our insistence [Edit: more like strong encouragement!] that people use hand sanitizer at a 4-day retreat with 40 people sharing food and close quarters?

So, I have noticed that I am overhygienic relative to the general population (when it comes to health; not necessarily when it comes to appearance), and I think that's standard for LWers. I think this is related to taking numbers and risk seriously; to use dubious leftovers as an example, my father's approach to food poisoning is "eh, you can eat that, it's probably okay" and my approach to food poisoning is "that's only 99.999% likely to be okay, no way is eating that worth 10 micromorts!"