Sigh.
The humvee was never meant to be an armored combat vehicle. It was designed to be a light transport vehicle, period. The fact that they are unarmored is hardly Rumsfeld's fault, since he didn't design it or lay down the specifications for the design.
And the question was hardly fair since steps were being taken months ago to provide armor for the humvees after their vulnerability to roadside bombs became apparent. Iraqi companies are being employed to apply armor to these American vehicles from cannibalized Iraqi military equipment. American companies are also producing armor for these vehicles.
The problem with these stop-gap measures is that the basic designs' suspension was not meant to handle the extra weight, which makes the vehicles unwieldy and unstable. I believe there was another post which pointed out that many American troops have been killed or injured by these modified and overloaded humvees.
I wonder if WWII GIs complained about their Jeeps being unarmored?