Watching Afghanistan’s cities fall to the Taliban in rapid succession, as the United States completes a hasty withdrawal from the country, is a surreal experience, laced with a sense of déjà vu. Twenty years ago, I reported from Afghanistan as the Taliban’s enemies took these same cities from them, in the short but decisive U.S.-backed military offensive that followed the 9/11 attacks. The war on terror had just been declared, and the unfolding American military action was cloaked in purposeful determinism in the name of freedom and against tyranny. For a brief moment, the war was blessed by that rare thing: public support, both at home and abroad.