"Someone (Pete?) posted a comment years ago something along the lines of, "Spray all the poppy fields, destroy all the cell towers and leave...". I have to wonder if that might have been the right choice. Just go back to keep the poppy fields sprayed as needed...."

Yes!

We had to invade Afghanistan, that was where bin Laden was, that was where the 9/11 attacks were staged from.
If Bush had any brains, after 2 months of fighting that war, he would have announced our withdrawal.
The Bush With Brains press release:

"We have shown the world what happens to countries that support terrorism against our country.
We will remain in Afghanistan for 10 months more. We will kill a few more Taliban, we will rebuild critical bridges, and will build a dozen modern hospitals and a dozen modern schools. Then, after a total of one year, we will withdraw.
Woe unto any new government in this country that dares to support terrorism against the United States."

What good have we done the world in the past 12 years of warfare in the Godforsaken land?
Every few months, one of our "allies," one of the troops that we have trained and armed, turns against us and murders several of our soldiers.
Good God, Get Out!!!

Rudyard Kipling summed up the futility of Western powers invading Afghanistan, 150 years ago:

"When you're lying wounded on Afghanistan's plains
And the women come out to cut up what remains
Just roll to your rifle, and blow out your brains
And go to your God, like a soldier"