The neo-imperialist neoconservatives all argue that the American departure and the subsequent collapse of the Kabul government are deeply destructive to American “credibility” as a superpower in the world. The underlying ideology of this view is of course the cherished concept that the United States must serve as global policeman everywhere and that a failure to do so is a sign of weakness and decline. 
This line of thinking is precisely backwards: it is the overall decline of America domestically and geopolitically that is the telltale sign of its deeper weakness; there is an increasing international belief that the United States is living inside a fantasy bubble of denial about maintaining its global hegemony. If the 20-year U.S. military presence in Afghanistan had actually ever shown any serious concrete advancement towards concrete goals, that would be one thing. But the neocons are ever content to throw good money after bad in the blind pursuit of hegemony — even in the very heart of “the graveyard of empires.”