I like it. There's an easier answer to "why don't people move from tribe to view". It's because it's painful to question one's own beliefs, and that's how that change happens. In fact such a move appears masochistic to many, since it almost never pays to undermine loyalty in favor of principle.

I hypothesize that we're seeing the influence of the legal system on the public turbo-charged by Citizens United money. An attorney is paid to be a "zealous advocate" for their client. This means never spending effort on anything that might be against the client's interest. Self-reflection is stochastically against their interest, so why even risk it? Considering alternative views might be against your interest, so why risk it? Therefore, in this new zeitgeist, such behavior is not just perverse and painful, but even unethical and wrong.

The problem, of course, is that for this system of adversarial argument you need an impartial judge. In theory that would be the public, but it turns out flooding people's minds with unethical lawyer screed 24x7 turns more people into lawyers, not judges. "The world is changed. I feel it in the water. I feel it in the earth. I smell it in the air. Much that once was is lost, for none now live who remember it." This could very well refer to the value of dignity, honor, integrity, fairness in debate, respect for one's opponents. These are always under assault, but in the last 10 years they have been decimated to the point people don't remember they ever held sway and young people don't know what politics was like when they did.