Since it (power) appears to govern everything, there's no way he could say it was evil, since it has to explain good as well. It's the standard problem for monotheists. ;)
The theme of the victim who winds up a happy participant in "evil" is, by the way, also a common horror genre trope. I believe that happened in Hostel II and Catacombs and Shadow Over Innsmouth. ;) It's also a favorite theme of Clive Barker -- who, by wild coincidence or not, is also heavily into S&M. :)
--- On Mon, 4/13/09, Mike Beggs <mikejbeggs at gmail.com> wrote:
Foucault’s
> point is that
> power is neither good nor bad in itself, just so long as it
> is
> reversible:
>
> "Power is not evil. Power is games of strategy. We all know
> power is
> not evil! For example, let us take sexual or amorous
> relationships: to
> wield power over the other in a sort of open-ended
> strategic game
> where the situation may be reversed is not evil; it’s a
> part of love,
> of passion and sexual pleasure." (EW1 298)
>