When I think about things like this, I can kind of understand why people are attracted to the idea of "smaller is better." People who believe in small government, Bill McKibben's views on regional projects, etc. With things like shipbuilding, developing power stations, exploration projects, etc., theres often so much money and planning involved that things literally take decades to develop, which makes it very difficult to suddenly change course. Contracts, loans, hiring and training personnel, and so on all factor into the decision making process. The bigger a project, the more sunk costs seem less like a fallacy and more like a justification for embracing a project's inertia.