Daniel Henninger pokes liberal leaders in the ribs with his latest Wall Street Journal column.

Surveying the fall in support for the governments of Barack Obama, New York City’s progressive Mayor Bill de Blasio and France’s Socialist President François Hollande, a diagnosis of the current crisis begins to emerge: The political left can win elections but it’s unable to govern.

Once in office, the left stumbles from fiasco to fiasco. ObamaCare, enacted without a single vote from the opposition party, is an impossible labyrinth of endless complexity. Bill de Blasio’s war on charter schools degenerated into an unseemly attack on poor New York minority children. François Hollande’s first act in 2012, like a character in a medieval fable, was to order that more tax revenue be squeezed from the French turnips.

Mr. Obama’s approval rating is about 43%, Mr. de Blasio’s has sunk to 45% after just two months in office, and Mr. Hollande hit the lowest approvals ever recorded in the modern French presidency. The left inevitably says their leaders failed them. The failure looks self-inflicted. …

… The text of the climate-change treaty at Copenhagen in 2009 included “thousands of ‘brackets,’ or alternative wordings.” A participant described the puzzle palace: “There are more and more parallel processes, and everything must be negotiated at the same time. The number of . . . negotiation issues has increased and many of these issues . . . are discussed in different places at the same time. . . . Very few people understand the whole thing.” Maybe they could just pass it to find out what’s in it.

One organization specialist calls this phenomenon “social deadlock.” ObamaCare is social deadlock. But the American left keeps doing it. This isn’t the 1930s, and smart people on the left might come to grips with the fact that the one-grand-scheme-fits-all compulsion is out of sync with the individualization that technology lets people design into their lives today.

Rather than resolve the complexities of public policy in the world we inhabit, the left’s default is to simply acquire power, then cram down what they want to do with one-party votes or by fiat, figuring they can muddle through the wreckage later.