While I grant there were many who were disposed to be irrational skeptics, lots of skepticism was generated by dishonest messaging, coercive mandates, and punitive limitations on dissenting speech. Institutions took an end-justifies-the-means strategy, and many smelled a rat.
Even now, online, you see right wing users continuing to lament over vaccine injuries, and on the left, long COVID. Ironically the injuries are often similar. They are, of course, both right.