If you haven't already, I highly recommend playing the Paperclips game that was posted recently. When your enemies are merely numbers on a screen, what does it matter who or what they are? Your machines are tasked to eliminate them, and if your machines are better than their machines--or, in this case, if the enemy don't have any machines--you win, and they disappear. Then you task your machines to clean up the mess, and in a short time, it's as if your enemies never existed.
We hope that there would be enough good people among the wealthy and powerful to avoid such a scenario--but would there? Do we know that for certain? I don't think we do. Look at how the wealthy and powerful already exploit people on both small and large scales, from Hollywood execs satisfying their sexual desires one victim at a time, to corporate execs exploiting cheap overseas labor that, to them, are merely numbers on a screen, helping them increase margins.
It all boils down to the same problem in the end, that of evil, and it's not going away, merely taking different forms throughout the ages.