Rory Stewart has a terrific piece in the London Review of Books arguing that Beltway foreign-policy thinkers are “minimising differences between cultures, exaggerating our fears, aggrandising our ambitions, inflating a sense of moral obligations and power, and confusing our goals” when it comes to Afghanistan:

Policymakers perceive Afghanistan through the categories of counter-terrorism, counter-insurgency, state-building and economic development. These categories are so closely linked that you can put them in almost any sequence or combination. You need to defeat the Taliban to build a state and you need to build a state to defeat the Taliban. There cannot be security without development, or development without security. If you have the Taliban you have terrorists, if you don’t have development you have terrorists, and as Obama informed the New Yorker, ‘If you have ungoverned spaces, they become havens for terrorists.’

These connections are global: in Obama’s words, ‘our security and prosperity depend on the security and prosperity of others.’ Or, as a British foreign minister recently rephrased it, ‘our security depends on their development.’ Indeed, at times it seems that all these activities – building a state, defeating the Taliban, defeating al-Qaida and eliminating poverty – are the same activity. The new US army and marine corps counter-insurgency doctrine sounds like a World Bank policy document, replete with commitments to the rule of law, economic development, governance, state-building and human rights. In Obama’s words, ‘security and humanitarian concerns are all part of one project.’

This policy rests on misleading ideas about moral obligation, our capacity, the strength of our adversaries, the threat posed by Afghanistan, the relations between our different objectives, and the value of a state…

Stewart’s prognosis is at once dispiriting and fortifying. On the one hand, “it is unlikely that we will be able to defeat the Taliban.” More sharply, “30 years of investment might allow its army, police, civil service and economy to approach the levels of Pakistan. But Osama bin Laden is in Pakistan, not Afghanistan.” On the other, “the Taliban are very unlikely to take over Afghanistan as a whole.” Why not?

It would require far fewer international troops and planes than we have today to make it very difficult for the Taliban to gather a conventional army as they did in 1996 and drive tanks and artillery up the main road to Kabul.

Even if – as seems most unlikely – the Taliban were to take the capital, it is not clear how much of a threat this would pose to US or European national security. Would they repeat their error of providing a safe haven to al-Qaida? And how safe would this safe haven be? They could give al-Qaida land for a camp but how would they defend it against predators or US special forces? And does al-Qaida still require large terrorist training camps to organise attacks? Could they not plan in Hamburg and train at flight schools in Florida; or meet in Bradford and build morale on an adventure training course in Wales?

So what on earth are we doing? “No politician wants to be perceived to have underestimated, or failed to address, a terrorist threat; or to write off the ‘blood and treasure’ that we have sunk into Afghanistan; or to admit defeat. Americans are particularly unwilling to believe that problems are insoluble; Obama’s motto is not ‘no we can’t;’ soldiers are not trained to admit defeat or to say a mission is impossible.”