Why on earth anyone would think that it's 'funny' to start a thread based on the musings on an unrepentant sociopath is simply beyond me.. The person in question was involved in the deaths of over 5,000 American servicemen and women, plus 100,000 other people.
At least Robert McNamara was, at the end of his life, reflective on the choices he'd made to escalate the Vietnam War.
Sociopaths are, by definition, unrepentant.
The whole known/unknown 2x2 table is based on some work by Talleb, author of The Black Swan, who briefed the US Dept of Defense on the concepts some time before Rumsfeld's speech.
From a logical point of view, it makes perfect sense. Of course, the outcome of the logical process still depends on pre-existing prejudices and ideologies, so those might be where Rumsfeld went wrong.