It's a cult. My parents became super religious out of nowhere in 2016 began worshiping Trump like he's a demigod. I regrettedly visited them with a few months ago and now they're prepping for civil war with "people from the cities". When mental illness reaches this point of criticality, there's no point of return. They simply live in a different reality. Voting republican is an existential crisis to them within their Qanon-based media bubble.