Critical thinking skills are hard, and fear creates more susceptibility.
More frustrating is that these ideas are not able to be disproven in the general population but through individual interactions, and building relationship, trust and then providing facts. It feels very counterintuitive but much of these believes become a part of a person's identity, so telling them "You're believe is wrong" feels like a personal attack.
Having had discussion with a a 12 year client around "Siren head" and the difficulty in managing to not roll my eyes probably gave me a headache so I don't go to the conspiracy theory discussion often.
Aside from Sasquatch.