I, for one, am not obsessed with being overly clean. When you're walking down the sidewalk in India, and a person just drops their pants and takes a crap on the sidewalk in front of you, that's pretty unsanitary conditions in a hot climate. That goes on a lot there. You can see the tell tale signs everywhere. If it happens on the sidewalk, I hazard to think what goes on in some kitchens.
There is a problem is so much antibacterial soap, etc that people aren't buidling antibodies as well as they used to. It's why I eat hot dogs from vendors in Manhattan. It builds antibodies!