Talk factually and not emotionally...
If Americans leave, it will allow the locals to form a Govt. of their own liking without a foreign dictation. If the locals elect Taliban or ex-Mujahideen, then that's their right. It's their country afterall.
What will happen for a while though is that there would internal feud just as was the case right after Soviet withdrawal. India will probably push for the current regime to remain intact, while the those opposed to it will want a fresh election to decide who stays and who goes.
Peace will eventually prevail.
Like exactly how it happened after Soviets left?