Trying to nation-build with Afghanistan.
Doesn't get much dumber than that.
Should have stuck a King in Kabul, given him the guns and money to hold the city and told him to make nice with the regional war lords (bombing the shit out of any real problems).
And declared victory and went home.
That sort of lazy foreign policy is why we're in Afghanistan. It's not sustainable. It just pisses off the locals and they rise up against us, or turn to terrorism. It doesn't work.