Disillusioned leftists become excellent conservatives. Read David Horowitz's "Radical Son" for the details.
Or read Michael Medved's autobiography, which showed why he too became a conservative after watching (and experiencing close up) the excesses of the Left in the 1960's and early 1970's.
Don't confuse these guys with disillusioned leftists, they are still leftists. It's Moore who was using them so that he could indulge himself. MM isn't for any side, he's for himself.
"Pick the target, freeze it, personalize it, and polarize it."