Doctors used to not wash their hands too. I get it though, and i've seen the same thing. Really it comes down to education and not granting access to secrets to people who aren't capable of handling them.
IIRC they even basically got some hospital admin fired for creating a hand washing mandate, despite it being proven to save lives.
https://www.npr.org/sections/health-shots/2015/01/12/3756639...
(talking centuries ago, but maybe even today)
Looks like its still a "recent" issue, lol https://www.nytimes.com/2006/09/24/magazine/24wwln_freak.htm...