Buried in the public relations blather of U.S. Marine legions "liberating" Helmand and Afghan (sham) "elections" as democracy-restored is an unspoken trade-off over who disproportionately dies in America’s modern wars in the Third World. Under George W. Bush, U.S politico-military elites chose to fight the Afghan war with minimal regard for so-called collateral casualties. But the soaring toll of killed Afghan civilians swayed world public opinion and stoked the Afghan resistance as grieved Afghan family members sought revenge. Enter Barack Obama. Faced with the prospect of NATO forces being withdrawn as restless NATO country citizens mobilized against the war, the Obama war machine took the decision to trade-off (mostly) lower-class U.S. "volunteer" soldiers from rural America for fewer rural Afghan civilians killed. The decision had nothing to do with valuing Afghan lives and everything to do with a careful political calculation.
And please remember the reasons the US is in Afghanistan in the first place. They are:
1. To install the pipelines to control Eurasian oil.
2. To protect the drug trade, from which so many profit so handsomely.