First off, this was genuinely valuable during the first few months. Gigantic medical institutions were moving at a glacial pace and were making proclamations literally months behind the state of the research. In order to conserve masks, propaganda was put out that masks were only effective if you were a medical professional, and the most common way I saw this rationalised was that the general public was simply too stupid to wear a mask in a sanitary way. So I proceeded to wear a mask in a sanitary way. Then after a few months mask stocks started to pile up so propagandists THEN pronounced that more science was conducted and masks were actually effective for everybody!
That positive outcome aside, what other people saw was that the younger people got, the lower the risks of COVID, and the higher the risks of getting vaccinated. In fact, it seemed from the numbers (This is for the earlier strains of COVID), that for certain populations (young people who lived like hermits, in other words, hacker news readers) it could be on a selfish individual basis, be irrational to get the COVID vaccine. The risk from myocarditis could actually outweigh the risk of COVID itself. It was however, always in the collective interest for as many people to get vaccinated as possible, to reduce the transmission of COVID, and reduce the consequent strain on medical resources and the direct/indirect deaths this caused. Public health institutions did not get into this nuance, because it wasn't in the collective interest, so they just told everybody the vaccine was good for you. I proceeded to get vaccinated, and the main person I held discussions with did not, after both drawing the exact same scientific conclusion. Not every anti-vaccer was stupid, some of them were just massive civil libertarians.
What I saw from people who DIDN'T do their own research is that they were UNIFORMLY misinformed because they tended to either believe institutions who would lie to them whenever it served their purposes (2 weeks to flatten the curve!), or believed whatever podcaster told them about Ivermectin.