I think the notion of a "fair" fight is incompatible with this argument. I don't know who's the arbiter of what's "fair" and what isn't, but I think that the flip side of all this is that the people who are fighting know they're being recorded, and they fight anyway. Seems to me that would lead to fairer fights, if you believe in the concept. The camera as an implicit contract. Group beatings on camera tend to provoke outrage pretty easily, because those are implicitly unfair. The person being beaten did not agree to be filmed, did not agree to the fight.
Ron Swanson thinks he's a pussy, but that's more because of the time Ron Swanson dropped 40 on him when they were both 6, and the moustache was merely "bushy."