Brilliance versus Experience
Individuals who have had the greatest experience with large organizations and plans tend to hold the greatest skepticism. They don't buy the "We just need to get the brightest people in place" assurances because they've seen very bright people come up with very dumb solutions.
They aren't impressed with complexity because they know how hard it is to get simple tasks done well and how vipers hide between the rocks of complexity. They smile at bold predictions because they know the flim-flam artists who write them.
This does not mean that they disdain optimism and large projects. It simply means that they have a greater respect for experience than for brilliance. As should we all.