I agree. And not just Jim Jones, we've seen many variations, the latest, IMO, Jodi Huisenfrut.
BTW, the so-called church of God's Misfits that comes up in google appears to be a lone guy called Squirrel who's posted for years on social media...not really a church. (Though the beard is similar). IMO this group that met in the Tw's home is just using the same name.
First, create a sense of 'unless we take action, we're doomed, it's us against them' I'm thinking politics may have been creating momentum that way.
Perhaps a cult of TA's personality...some kind of mind control techniques, devotion to her as their leader, stoked by anxiety about upcoming election, need to practise striking out...
Especially the part about Cora sharing the details with her daughter - IMO, she just didn't see anything wrong in what they'd done. She never expected her daughter might disagree.
JMO