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Your post goes right back to O'Reilly's comment that "there isn't much of a far right in this country" and that's why he spends so much time talking about "the far left."
He has it completely opposite. As Glenn notes, your point is vitally important. Would the right wing noise machine be able to function if it became clear to everyone that there is no larger "left" or "liberal" or "progressive" movement? That's where their real war is. I guess that's why they had to manufacture a movement. Movement Conservatives need an enemy to push their policies. If they don't have one, they'll just create one.