Matthew Scully is a speech writer for President Bush and the author of “Dominion: The Power of Man, the Suffering if Animals and the Call to Mercy.” Michael Pollan is a writer and the author of “The Botany of Desire” and a new York Times Magazine article called “An Animal’s Place.” They talk with Steve Paulson about the morality of eating meat and the ethical alternatives. They deplore factory farms and most commercial meat production.