And that's mostly because we are that stupid. We operate in an environment of very incomplete information, draw mis and un informed conclusions, promote them with absolute passion, and are disappointed, or more often, accusatory of others when WE are wrong.

My best conclusion, for what it is worth, is that we are heavily propagandized from both the right and the left, and usually can't tell the differences.

I think it's a lot like fishing. We can, and should, listen to what others say... and then we have to learn to think, or to fish, for ourselves.