Covid taught me that there is a large percentage of population that won’t trust experts to the point of ignoring critical thought. Also dangerous.

Here is an example: in the early days of Covid around February 2020, the messaging from public health authorities was that it was important to wash hands regularly but wearing masks wasn't important. This went against my non-expert intuition and thought, since news out of Wuhan was already clear that it was like a kind of pneumonia, so it affected the lungs. I discussed this with my mom who shared the same thought. I went on to buy masks when they were still readily available back in early February 2020. Later I learned that the reason public health authorities de-emphasized masks was because they thought they needed to prioritize masks for healthcare workers due to a foreseen supply chain shortage. This of course made sense from a whole population perspective but not from an individual perspective. Do you prefer to be selfless and do what's good for the whole society or do you want to be selfish and do what's optimal for yourself?

Here's another example: the various screenings with age cutoffs. For example colorectal cancer screening is only recommended for people above 45; statins are only recommended for the prevention of cardiovascular disease after age 40 with risk factors. I've had a few primary care physicians who follow these guidance like gospel and refuse to do screening because I haven't met the age cutoff. The reason why these cutoffs exist is mainly a cost/benefit analysis for the entire population, not an analysis tailored for an individual.