It's crucial to hold in constant memory that Afghanistan is the societal equivalent of an illiterate teenager. The child-nation will fail unless we are willing to adopt the people.To that description I'd add the "teenager" is the product of a culture whose idea of the perfect state is a caliphate, a kind of theocratic autocracy.
Given all this, becoming the "foster parent" of Afghanistan is not a promising prospect. The basic question becomes: Is the alternative even worse?