There were random interviews in the capitol saying all these weird stuff from the internet, and people in US often know someone who'd be convinced this way.

So its not like this crazy stuff is hard to prove is prevalent (pun intended) among certain groups.

What is hard is actually putting figures on it when worldviews get so warped due to circular logic. This is bad, because there are real reasons people are upset. Underlying reasons that need to be properly addressed.