Saw this article linked to on twitter in another context and thought it thought provoking and in line with 'the extremist brain' and the inherent problem of social media echo chambers on political thought processes and how they can take on cult like traits.
www.livescience.com/63658-why-people-believe-conspiracy-theories.html
Profiling a Conspiracy Theorist: Why Some People Believe
Consistent with previous research, we found that one major predictor of conspiracy belief was "schizotypy." That's a constellation of traits that include a tendency to be relatively untrusting, ideologically eccentric and prone to having unusual perceptual experiences (e.g., sensing stimuli that are not actually present). The trait borrows its name from schizophrenia, but it does not imply a clinical diagnosis.
Schizotypy is the strongest predictor of conspiracy belief. In addition to experiencing the world in unusual ways, we found that people higher in schizotypy have an elevated need to feel unique, which has previously been linked with conspiracism. Why? Probably because believing in non-mainstream ideas allows people to stand out from their peers, but at the same time take refuge in a community of like-minded believers.
In our studies, conspiracy believers were also disproportionately concerned that the world is a dangerous place. For example, they were more likely to agree that "all the signs" are pointing to imminent chaos.
Finally, conspiracists had distinct cognitive tendencies: They were more likely than nonbelievers to judge nonsensical statements as profound – for example, "wholeness quiets infinite phenomena" – a tendency cheekily known as "bullshit receptivity."
Fascinating article with a few point points in it I've not highlighted which are relevant such as pointing to cult like tenancies which think the entire world is against you, so having a need to blame someone and groups forming to produce hope against the mentality that the world is against you.
Would also explain self appointed 'saviours' of the community where being 'persecuted' is part of the dynamic.