Drake: why may I ask the difference between Iraq and Afghanistan?
Iraq is at the heart of the Arab region, a region that must be politically transformed if we ever want to beat Islamism. As such, successful nation-building and liberal democratization in Iraq will have an immensely positive effect on both the region and US interests. This great positive effect makes the difficult nation-building process in Iraq worthwhile, IMO.
The same thing can't be said for Afghanistan. What does America get out of the effort it will take to build Afghanistan? Is Afghanistan going to provide an example for reform in Iran or Pakistan? I doubt it. Will Afghanistan provide us with a strong ally in a vital region? Not really. I can't really find any strongly positive outcomes of a rebuilt Afghanistan that would justify intensive US involvement; I can in Iraq. That's the difference, IMO.
Clinton also would have brought our allies into the fight, rather than make them hold our tailcoats, even though they were begging us to let them join the fight. The entire world was outraged and wanted revenge on the Wahabbists, and Shrub blew it.
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