The pervasive mythology of American exceptionalism is essentially a religious doctrine positing that the US is essentially a perfect nation. Consequently, any issues arising within the system are perceived as external threats rather than inherent flaws. This mentality fuels the polarization between mainstream Republicans and Democrats, much like a religious schism. Both sides have a different interpretation of the doctrine and view each other as heretic traitors intent on destroying the nation.
I agree with that, I was referring to the actual voting base itself though. I imagine that the cult leaders on each side are generally aware of the game they’re playing. It’s also worth noting that polarization is necessarily becoming more pronounced as the economic conditions decline.