OK, I'll break it down. There are basically 3 types of beliefs people have.
1)
What is - beliefs about the nature of reality, which allow us to live our daily lives. e.g., 2+2=4, gravity, gas makes car go etc. Virtually zero disagreement here.
2)
What ought to be - beliefs to guide one's life and community, guided by ethics and rationality. e.g., parenting, community norms, principled voting and advocacy. group differentiation starts, but strong overlap. many GOP and Dems parent the same, and generally live the same lifestyles.
3)
What am I - beliefs that signal to others community membership, tribal allegiance, common enemies.
necessarily involves accepting the hypocrisies that come with in-group identification. e.g., a gas-loving Dem drives a car everyday while advocating immediate decarbonization; a GOP raging against




philia while ignoring the entanglement of their own politicians. massive group separation, like people living on two different planets.
Unfortunately, politics--and social policy in general--is ideally founded on leaders who inspire thoughtful engagement with the first two sets of beliefs, however, it is easier to control the populace if the leaders marshal allegiance through the valorization of identity