An epistemic epidemic. I think certainty kills more than uncertainty. If you're unsure, you err on the side of caution (because it's life-threatening), however, if a person is certain there is no threat when there actually is, that kills.
@tripu
I was thinking about the current pandemic when I made my comment.
Sometimes the cautious thing to do is change. If some new evidence comes up that indicates a chance that a change in behavior would be much safer, as with hand washing, and there is little cost or risk with the new behavior, then it may be better to adopt the new behavior while continuing to investigate.
This is what some are doing in response to the omicron variant.