Most leftists in the USA have been so busy condemning the 9/11 bombers, apologizing for offering leftist explanations of socio-political causes of terrorism, and coming up with "practical alternatives" to the war that they're not in a position to actually implement (even after the Anglo-American bombing of Afghanistan began!) that they have yet to get around to pointing out the obvious: those who can't even protect its own department of defense are not competent even by capitalist standards & are certainly incapable of making Americans safe from terrorism.
Yoshie