Here’s another example, which has actually happened 3 times to me already:
The truly ignorant don’t wear masks.
Many people wear masks or encourage others to wear masks in part to signal their knowledge and conscientiousness.
“Experts” counter-signal with “masks don’t do much”, “we should be evidence-based” and “WHO says ‘If you are healthy, you only need to wear a mask if you are taking care of a person with suspected 2019-nCoV infection.’”
I respond by citing actual evidence in the form of a meta-analysis: medical procedure masks combined with hand hygiene achieved RR of .73 while hand hygiene alone had a (not statistically significant) RR of .86.
After over a month of dragging their feet, and a whole bunch of experts saying misleading things, the CDC finally recommended people wear masks on April 3rd 2020.
Here’s a quote from Wei Dai, speaking on Feburary 26th 2020,
After over a month of dragging their feet, and a whole bunch of experts saying misleading things, the CDC finally recommended people wear masks on April 3rd 2020.