Food safety inspection is a relatively recent innovation. Somehow our ancestors survived. Diarrhea isn't fun, but one can generally avoid it by avoiding liquids that haven't been boiled. Most foodstuffs don't require near as much refrigeration as an American might imagine.

"Somehow our ancestors survived"

Well, most of them did. This is the most literal example of 'survivor bias' imaginable. Look up 'sausage disease', to just name one.

EDIT: this line of thinking is similar to people saying 'let children roam free, most abductions are done by people the victims know anyway!' or the anti-vaxxer 'why vaccinate when measles is so uncommon!'. Well yes, all of those things are the way they are exactly because of the thing those people are railing against.

I think your point only holds for abductions if you can demonstrate that there were more prior to the cultural change in attitude towards roaming. Is that demonstrable? I don't think it is. On the other hand, diseases like the measles were definitely a widespread problem before vaccinations were developed.

Sure, my ancestors survived, and so did I, every time I've eaten at such establishments. Why should I care about some hypothetical person? She can take care of herself.

Your EDIT undercuts your argument completely, because it makes clear your utter innumeracy. Abduction is not a thing that USA parents should worry about. Automobile accidents? Childhood obesity? Absolutely they should worry about those, but you don't care because automobiles and lack of physical activity are integral to your comfortable suburban lifestyle.

Yes and no, those stalls survive on repeat customers. There's a very strong incentive not to poison them.