I think the main thing that gave rise to those who opposed the vax were the obvious lies and censorship that the authorities blanketed the web with, these were easy to disprove with a little research
But people are lazy, complacent and did the normal thing of believing their doctors and their politicians, after all they would never lie to us would they ?
I had a wife who was in her eighth year of Chemo so had no immune system left and no defense against infection, so it was essential to investigate anything which may make her worse
Even back in early 2020 it was clearly obvious to me that the whole thing was very suspect and the lies were starting to flow to cover up what was really happening, but the authorities knew that the public could be relied on to ignore the obvious cover ups so they pressed on and are still doing so
