The Taliban is not yet crushed.
Injured, yes. But they are still there and still hard at work.
It would have been nice to finish one job before embarking on another, even though Iraq was the target from the beginning. It would also have been nice to act consistently like people that the Afghans would like to emulate, instead of resorting to torture, detention for indefinite periods without trial, and so forth.
If the American Way becomes equivalent to torture and corruption in the region in the minds of its people, fed by our own behavior if you please, why should the citizens there believe in our high-falutin' words? If we will torture anyway, why not be tortured by their home-grown thugs? At least retaliation against those guys would be easier...