Over the course of the pandemic this threshold was crossed for a lot of people.
This is how many people realized that COVID is airborne and that only N95 and better respirators provide real protection. People now discuss air cleaning, the impacts of Long COVID, etc. The vaccines were seized upon by the political parties as a wedge issue to force the economy open. They help with medical system capacity, but do not block transmission and Long COVID.
You can find an ongoing science based pandemic response policy at https://pandemicjustice.icu
Their was no vaccine at this point so no one against it yet.
The critical thinking can be found in the independent minds of those who made the choice to wear a mask. Listening to an expert didn't play out well.