Afghanistan, among many others, is a perfect example of why the US doesn't need to be nation-building in the middle east. US taxpayers are on the ongoing hook for about $114 Billion down the Afghani toilet since 2002. And what did we get for our money?
Since the US stupidly attempted to defeat the Taliban there and then stupidly decided to install our particular brand of democracy, from the top down the whole country has become a cesspool of Pentagon-financed corruption, graft, and violence.
The poppy warlords, Taliban rabble, military, and politicians all have their hands out snatching money, coercively taken from US taxpayers at the point of a gun, handed out like Halloween candy by the US government, desperate for something they can point to as an Arab-related victory in the middle east.
It is an utter failure, just as Iraq, Libya, Syria, and probably Egypt will ultimately be utter failures too as far as American influence there.
Enough already. Get out of there, wash our hands of the whole mess, and leave them to their own devices. If they ever decide to come this way with bad intentions, we'll know it and we'll kill them as their toes hit the water on their shores, otherwise who cares what happens to them?