If I was the wolf, I'd just point out that the shepherd eats lamb too, and is therefore just as much a murderer. The only difference is the amount of power in the equation. The wolf doesn't need to be bigoted to make its point, there are much better criticisms against the way the shepherd deprives the sheep of liberty. I didn't really understand why Lincoln was describing a foolish wolf who attacks the shepherd for bad reasons instead of readily available good ones. What the wolf says is pretty nonsense to me.