I watched the Rumsfeld interview on MTP. He clearly was holding back on fully answering the question (which is understandable). Parse his answer ... he said he was not aware of a MAJOR air exodus ... a tacit admission, in my book, that they were aware of (and did nothing to stop) a "MINOR" air exodus out.
I'm sure everyone recalls the sketchy news reports at the time. I think it's best to fess up that they agreed to very limited evacuation of Pakistanis, but that it got out of hand.
Translation: the U.S. agreed to allow Pakistan to evacuate its ISI officers, and then Pakistan chose to evacuate everybody it could.