Earlier quoted context omitted.
On the other hand, just as it's not really paranoia when they're really out to get you, a protection racket is preferable to being overrun by hordes of Teutonic Nietzcheans. :) Having the same structure doesn't always mean being the same thing.
Except that in the case of the middle ages, if there weren't any bloodthirsty "nobles" to begin with, "protection" wouldn't be necessary in the first place, so to me at seems at least in part not just the same structure as a protection racket but the same substance as well.
This is not to imply that the nobility always _did_ oppose the enemies who they should have been opposing; but it's not at all the case that had there been no feudal militaries, medieval Europe would have been a peaceful place.
(I acknowledge that this is a very late post, and I apologize for that; but it's a common mistake to imagine that medieval European history occurred in a vacuum. The primary culprit here is the, ah, _insular_ way that English-speaking schools teach medieval history...)