Rick answers my question:
Let’s go a step further than institutions: Instincts.*
Our ancestors survived a dangerous natural environment by taking on genetic strategies that allow us to use our big-old-dolphin-brains in clever ways, but that falls short of perfect Spock-ness. We are easily excited by certain things and will often answer easier questions than the ones posed to us without realizing it.
So besides the fact that it’s genuinely rational to be ignorant, our psychological makeup creates a situation that exacerbates the problem. Voters ask the question “will I be better off in four years with that asshole in charge or this one?” but answer the question “which of these schmucks would drive me to suicide slowest if I were trapped on a desert island with one of them?”
Let’s get back to the institutional question… Rational ignorance is a thing because we are facing a collective action problem. Through repeated play the problem of rational ignorance has created an electoral institution that rewards showmanship (playing on the psychology of voters). There are two questions: 1) Why did things unfold so that this is the case? 2) How might we change them for the better?
I suspect the answer to 1) is that people genuinely thought voting was going to be about information. Perhaps it even was at some point. And if it was successful it’s only natural that its scope would be expanded. But as its scope expands the informational issues become larger and it becomes more rational to be ignorant. (That’s one possible story but not the only one.)
The status quo isn’t going to change without a major shift in the way people think. One way to get that shift would be to fix high school civics classes (Okay, where do I sign up for sea-steading?!). I think one of the higher marginal benefit things is satire (tangent: my introduction to satire was This Hour has 22 Minutes which I watched before I was a full-blown libertarian). One reason I like Jon Stewart so much is that he fights back against the non-role of information in the political-media nexus. If “the people” acknowledge that politics isn’t about making “the right choice” in some objective sense they will be admitting the problem.
*Now, if I remember my last anthropology class correctly instincts aren’t as real as we think they are… but what from what I’ve gleaned about evolutionary psychology and neurology there is hard-wiring, or something like it, that kinda-sorta stands between instinct and culture. So I’ll (perhaps incorrectly) use the word instinct as short-hand for psychological features of humans that arose from our evolution as a social animal.