The most counter-intuitive idea in economics
Many things about economics are counter-intuitive. People see industries break down in their own country only to sprout up overseas, leaving native workers unemployed. It's very counter-intuitive for anyone to believe "supporting" these industries harms the country.
Another counter-intuitive idea in economics is that failure is essential to a prosperous economy. When an enterprise fails, there is pain, uncertainty, and dislocation. Sometimes failure happens in bunches, magnifying the downside.
So we have the entire economics establishment trying to avoid failure at all cost.
- "If the big banks hadn't been bailed out, we'd have had 30% unemployment. Those bailouts and quantitative easing and ZIRP saved us from a depression."
- "A gold standard would nullify monetary policy, thereby allowing no tools to aid employment."
- "The gold standard resulted in frequent recessions."
All of these arguments imply failure is almost always something to avoid. I'm not sure economics has ever shown that the alternatives to these examples of failure are preferable over the long term.