“Beyond loyalty, McNamara persuaded himself — as did other internal skeptics such as Undersecretary of State George Ball — that he could better influence policy by staying put. Moreover, he wasn’t absolutely sure in his bleak diagnosis. Maybe, just maybe, things would turn out well after all, or at least stabilize sufficiently to be handed off to the next administration, preserving not only Johnson’s historical credibility but also his own. As Leslie H. Gelb, himself a veteran of McNamara’s Pentagon (and later a member of The Times editorial board), has written, “It is almost superhuman to expect one responsible for waging war” to fundamentally rethink its merits and then to act on the basis of that rethinking. “And so doubts simply float in the air without being translated into policy.””
From the NY Times.