The senator was vexed. The U.S. auto companies were resisting attempts by her and other Senate well-meaners to impose a radical rise in fuel efficiency by 2017. Why can’t they be more like the Chinese, she complained. Or to quote Sen. Dianne Feinstein precisely: “What the China situation, or the other countries’ situation, shows is that these automakers, in all of these countries, build the automobile that the requirements for mileage state. And they don’t fight it, they just do it.’’ Yes. That is how things work in Communist-party dictatorships. It is odd to hold up China as a model...