It is clear that none of us can know everything. Especially in politics, the extent of individual ignorance is significant. As I argued in a previous series of posts, I suspect that each of us is simply not competent to decide large-scale political issues. To put this in a slightly pretentious slogan, no single mind can capture the truth. A second observation I have stressed is that people strongly, deeply and reasonably disagree about the truth. Even where we do think we have captured the truth, we seriously disagree over what it is.
It’s useful to think about how these two different observations fit together. In some philosophical quarters, there is optimism that intellectual diversity is a good thing, rather than a disadvantage. The idea is that we all possess a different piece of the truth—disagreement indicates that we need to fit these pieces together. Call this the puzzle metaphor. On the puzzle metaphor, it’s not greatly troubling that we disagree and that no single mind can capture the truth, as long as we are decently cooperating in putting the puzzle pieces together. Disagreement is a challenge, but a surmountable one.