Impractical
Remember, were talking about a country where the predominent industry is production of "controlled substances", the primary occupation is murder, and their version of football involves a freshly decapitated goat as the ball.
Obey U.S. law? The very concept of obedience to any law is completely unknown in Afghanistan, and they wouldn't be able to understand it if it were introduced.
If we killed every adult male (looks like "adult" starts at about 12 there) as combatants, the women would bring up the male kids to be "just like daddy".
No, Afghanistan is pretty much a write-off.
On the other hand, presuming their continued and increasing cooperation, we should do our best to see that Uzbekistan and Tajikistan become notably secure and prosperous compared to their neighbors (Tajikistan just offered use of three airbases). Pakistan is still an open question.
