Using the clip without his permission would be a legitimate complaint, but if it was broadcast on NBC's Nightly News prior to the production of the movie - would that make it accessible to the general public and fair game?
I can't say I'm a fan of the guy, but Moore started ripping up Bush on the war years before the rest of the country did. Everybody is calling Bush the potentially worst President in history (even TIME Magazine) quite some time after Moore started throwing a tantrum about it. Sure, a lot of the stuff he has said is retarded - but then there's the rest that isn't.
I'd still be really pissed off if someone twisted around what I said and showed it to the entire country, though.