Why Is It Wrong for Me to Kill When It's Not Wron for Lions to Kill?

"It's still not clear to me why it would be wrong for creatures who have considerably complex neurological systems to inflict harm on each other," he says. "Once I become the kind of creature in the evolutionary process, once creatures evolve that are capable of stepping back from their actions ... then there are reasons for me to behave in certain ways and to avoid other kinds of behavior."