It's a conspiracy theory, so even education doesn't always help. Kary Mullis is one example of someone who was smart enough to win a Nobel prize for his work on PCR... but unfortunately later fell into the conspiracy theory rabbit hole for HIV, climate change, etc.

I have read that anxiety issues [1], as well as a personality spectrum called "schizotypy" [2] which in itself can be linked to severe anxiety issues at the heavier end of the spectrum, [3] is linked to the ability to believe conspiracy theories [4]. My guess is that the wide spread of conspiracy theories related material (which COVID-19 has amplified to considerably) boils down to some combination of mental health and other social and/or economic anxieties, and the conspiracy theories really won't go away until some of these anxieties are addressed.

[1] https://www.scientificamerican.com/article/people-drawn-to-c... [2] https://en.wikipedia.org/wiki/Schizotypy [3] https://en.wikipedia.org/wiki/Schizotypal_personality_disord... [4] https://www.psypost.org/2017/10/study-links-facets-schizotyp...