[oblio]

People are vain. People's vanity is so strong that they are willing to kill and maim others and even do insane things such as declaring wars.

Regarding your checklist, you should read about Semmelweiss: https://en.wikipedia.org/wiki/Ignaz_Semmelweis

It's crazy to think that entire generations of doctors retired and died arguing against washing your hands!

[kennywinker]

Might have surprised me before 2020, but the amount of people throwing hissy fits over masks this year has prepared me for the ridiculous stubbornness of humans asked to change.