When Barack Obama stepped into the Oval Office, he stepped into a cycle of American history, best exemplified by F.D.R. and his distant cousin, Teddy. After a great technological revolution or a major economic transition, as when America changed from a nation of farmers to an urban industrial one, there is often a period of great concentration of wealth, and with it, a concentration of power in the wealthy. That’s what we saw in 1928, and that’s what we see today. At some point that power is exercised so injudiciously, and the lives of so many become so unbearable, that a period of reform ensues — and a charismatic reformer emerges to lead that renewal. In that sense, Teddy Roosevelt started the cycle of reform his cousin picked up 30 years later, as he began efforts to bust the trusts and regulate the railroads, exercise federal power over the banks and the nation’s food supply, and protect America’s land and wildlife, creating the modern environmental movement.

Those were the shoes — that was the historic role — that Americans elected Barack Obama to fill. The president is fond of referring to “the arc of history,” paraphrasing the Rev. Dr. Martin Luther King Jr.’s famous statement that “the arc of the moral universe is long, but it bends toward justice.” But with his deep-seated aversion to conflict and his profound failure to understand bully dynamics — in which conciliation is always the wrong course of action, because bullies perceive it as weakness and just punch harder the next time — he has broken that arc and has likely bent it backward for at least a generation.

When Dr. King spoke of the great arc bending toward justice, he did not mean that we should wait for it to bend. He exhorted others to put their full weight behind it, and he gave his life speaking with a voice that cut through the blistering force of water cannons and the gnashing teeth of police dogs. He preached the gospel of nonviolence, but he knew that whether a bully hid behind a club or a poll tax, the only effective response was to face the bully down, and to make the bully show his true and repugnant face in public.

IN contrast, when faced with the greatest economic crisis, the greatest levels of economic inequality, and the greatest levels of corporate influence on politics since the Depression, Barack Obama stared into the eyes of history and chose to avert his gaze. Instead of indicting the people whose recklessness wrecked the economy, he put them in charge of it. He never explained that decision to the public — a failure in storytelling as extraordinary as the failure in judgment behind it. Had the president chosen to bend the arc of history, he would have told the public the story of the destruction wrought by the dismantling of the New Deal regulations that had protected them for more than half a century. He would have offered them a counternarrative of how to fix the problem other than the politics of appeasement, one that emphasized creating economic demand and consumer confidence by putting consumers back to work. He would have had to stare down those who had wrecked the economy, and he would have had to tolerate their hatred if not welcome it. But the arc of his temperament just didn’t bend that far.