Sorry to burst your bubble:
Notes: allegedly said by George Orwell although there is no evidence that Orwell ever wrote or uttered either of these versions of this idea. They do bear some similarity to comments made in an essay that Orwell wrote on Rudyard Kipling, when quoting from one of his poems. Orwell did write, in his essay on Kipling, that the latter's "grasp of function, of who protects whom, is very sound. He sees clearly that men can only be highly civilized while other men, inevitably less civilized, are there to guard and feed them." (1942)
Alternative: "We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." - Winston Churchill (miscellaneous quotation, no date)