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This got me thinking..
Imagine that the situation in Afghanistan were exactly what it is today -- a corrupt government in Kabul with dubious legitimacy, the Taliban gaining strength, al Qaeda's leaders still hiding out in northwest Pakistan, etc. -- except that the U.S. military wasn't there. And then ask yourself: would you be in favor of sending 100,000 or so American soldiers to fight and die there?
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My views on this subject are clear, so feel free to discount what follows. But I doubt we would be having a serious debate about sending a large number of troops to Afghanistan if we weren't there already. Instead, we would be treating Afghanistan the same way we treat most failed states. We'd express our concern, offer modest amounts of humanitarian assistance, we'd let the U.N. do its best, and if we thought al Qaeda was operating there, we'd go after them with special forces and Predators or other military assets. Just look at how we are currently dealing with Somalia or Yemen or Sudan and you get an idea of how we would be dealing with Afghanistan if were we not there already.
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And notice that the scenario I've posited is actually more favorable than the one we are actually in. In this counterfactual, Kabul is losing on its own, whereas in reality, Kabul is losing even though there are 100,000 or so foreign troops already trying to help, at a cost that far exceeds the entire GDP of the country. At this point, nobody should be under no illusions about how hard this really is.
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Of course, one can argue that the simple fact that we are already there fundamentally alters the strategic calculus. We wouldn't intervene if we were starting from scratch today, but some will say that allowing ourselves to be defeated by the Taliban will have disastrous effects on our reputation and encourage bin Laden & Co. to believe they are winning.