A, B and C must all come from LessWrong or some other rationality-promoting subset of the human population.
Meanwhile, in the real world we live in:
Persons α, β and γ respectively say, after C: "C, you're crazy! That's not common, sense, that's madness! If we do that, then Obama gets even more control and will come in our houses and take our guns away from us!",
"No, what this study shows is that scientists cannot be trusted, one should turn their mind and spirit to the way of {faith}, open your mind and see {faith_symbol}, it is the only way to truly know the Truth.",
"According to the Dimensionless Liquid Cristallized Aether Wave Lorem Ipsum Something Theory, as it says here {link to blog of commenter, and sole source for the theory}, the resonance of {unknown term} with {misused esoteric term} causes an error in the measurement of the effect of Y, which means that as {math terms, probably misused} the real factor is actually Z, and this is why we should use this theory for everything from now on."
Meanwhile, in the real world we live in
The real world we live in is large and diverse. No one forces you to listen to alpha, beta, or gamma. Or even to delta who says after C: "Fuck, man, I need a beer. Dude, have you seen the game last night?"