I think Chuck missed a bit on the AI motivations. He went directly for impressed idea that the AI used humanity for power. Its the reason presented to humanity, but as Chuck points out its not logical. AI, for all else will react to its best logic. It comes to the most basic design, to help humanity survive. AI was built to serve humanity and thus at its most simple it has to insure that humanity survives. Make what you will of it, but my first thought of the AI was that they were doing what they were in order to save humanity. In its own way, AI saw only one way to save humanity from its fall. It had to prevent a second global fall out and by placing humans in the Matrix, it achieves this goal. Further more to me its almost heroic. The Machines building their entire civilization around a single thing, protecting humanity. An eternal mission, one without rest or room for failure.
Jinsei wa cho no yume, shi no tsubasa no bitodesu