To John & Kampervan, you presume quite a number of things:

- That the Afghan farmer has any choice in what he grows
- That the Afghan farmer has the option to sell the crop that he has been ordered to plant to anyone other than those who ordered him to grow it

The incentive for the farmer to do the bidding of those who direct his agricultural endeavours is quite simple and extremely cheap - Do as we say or we will kill your family.