Foresomeone who has so many opinions, you know quite few.
E.g. birthbed infections strictly speaking don't come from 'not washing hands'. They where prone in the time where doctors experimented/cut open corpses (in various degrees of rotting, with various invections due to which said corpses had died) . The doctors jumped right from the lab to the birth giving woman, and because of dead corpse poison etc. the women often died. Ofc, that would have been aboided with proper desinfections.
However if a random stranger with unwashed hands helps a pregnant woman to give birth, the risk of an infection is close to zero.
For millennia women gave birth without nasty high childbed deaths.
The rest of your post is equally wrong ... if corn would not self 'fertilize' as you call it, we had no harvests.
Regarding risk, you are mixing up risk with likelihood ...