How did a man who took office espousing a new era of engagement with the world end up a spectator to this century's greatest humanitarian catastrophe?
Barack Obama was not against using force to protect civilians. Yet he resisted, to the end, a military intervention to stem Syria's six-year civil war, even as it killed or displaced half the country's population, brutally documented in real time on social media.
Part of the answer to this vexing question has been clear from the beginning. President Obama was elected to end America's wars in Iraq and Afghanistan by a people tired of paying the cost in blood and treasure. He was extremely reluctant to get sucked into another messy Middle East conflict.
But when the siege and bombardment of cities like Aleppo placed the violence on the genocidal scale of atrocities set by Rwanda and Srebrenica, inaction by the US and its allies mocked the international community's vows of "never again".
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