Some of his tough questions:
Why are we actually in Afghanistan?
Is the availability of "sanctuary" (in a world of myriad sanctuaries) really important?
Do the benefits of denying sanctuary in Afghanistan fit into any cost-benefit logic for the U.S.? (vs. benefits of Afghan sanctuary to the terrorists)
Are we confusing sunk costs with future investment decisions?
Do we truly understand that successful COIN is a means toward an end -- rather than an end in and of itself?
And most importantly: Are our actions in Afghanistan and the region reducing the terrorist threat to the U.S.?