I don't think we are at any risk of living in too sterile an environment. If anything, the knowledge that at least 1/3 of people don't wash their hands after they poop... is just one of the lovely ways we get exposed to a lot of interesting "biological matter".
Practically everything we touch in public has someone else's complex human fecal matter on it, plus stuff from other sources.
Practically everything we touch in public has someone else's complex human fecal matter on it, plus stuff from other sources.