If you’re kept isolated and ignorant by an undermined education system, geographically and social media algorithm bubbled, limited economic prospects, and normalized extreme right wing propaganda you get these feelings like you would be morally justified in spreading your particular view to others by force to save them or society or whatever or however bad your ‘team’ is the other must be worse.

It’s not uniquely American, it’s the same right wing, nationalistic, authoritarian rhetoric used as everywhere else, it’s just more religious believing countries like the US tend to be more susceptible to this type of ideological rhetoric because it usually uses the same language and feelings as religious belief.

I suspect it’s currently amplified by more liberal leaning followers leaving the party just like in the churches, leaving more fundamentalist believers to push more extreme ideology in lack of internal opposition, but that’s probably just one of multiple reasons