Which is why at the end of the day, regardless of what one believes about social issues, people vote their perception, too often based on propaganda and confirmation bias, which the Republican party, and those that have hijacked it (way before Trump--I refer to the likes of the Koch brothers) do a much beter job of, having studied and employed the methods and success of coming to power of the fascist movements in the 30s. It is absurd that it's ok to use deceptive advertising to get elected but not to sell a package of chewing gum. I touch upon many of this and the "left" "right" divide here, https://medium.com/illumination-curated/can-we-please-all-find-the-space-within-which-to-breathe-the-same-air-and-agree-not-to-agree-6b6b2c8077ec but not from the rigorous philiosophical analysis that you undertook so well and from which I learned much. My piece focuses on possible solutions, some of which I admit are unlikely, such as making political parties unconstitutional.
Your description that it's all about power explains the loyalty to party over country/constitution.