As far as I cannot tell neither are really the driving factor, rather it’s a desire to believe. People who want to believe in X look for stories which confirm X. X can be UFO’s, or Muslim rape gangs, the blood libel, or FEMA detention camps... it doesn’t matter. What matters is that the story reinforces the desired beliefs, then many people won’t think too hard about it, they’ll spread it to like-minded people, and reinforce the belief. The thinking looks lazy, and the person may look partisan, but that isn’t the active ingredient. You see this pattern in everyone from free energy cranks, through anti-vaxxers and hyper-partisan ideologues, to people who simultaneously believe that Princess Diana was murdered, and that she faked her own death and is still alive. Likewise people who believed that Osama Bin Laden was dead before the SEAL raid that killed him, were most likely to believe that he wasn’t killed and is still alive!
https://www.livescience.com/18171-contradicting-conspiracy-t...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5724570/
https://www.researchgate.net/publication/235449075_Dead_and_...
It’s a breakdown in how humans think and believe, it’s just that. It doesn’t dominate everyone’s thinking, but it dominates enough people to skew elections and online conversations.