Stranger in a Strange Land

it."
                "Um. Duke, didn't you tell me you had some Indian blood?"
                "Huh? Yeah, an eighth. In the Army they used to call me 'Chief.' What of it? I'm not ashamed of it. I'm proud of it,"
                "No reason to be ashamed-nor proud, either, for that matter, But, while both of us certainly have cannibals in our family trees, chances are that you are a good many generations closer to cannibals than I am, because-"
                "Why, you bald-headed old-"
                "Simmer down! You were going to listen; remember? Ritual cannibalism was a widespread custom among aboriginal American cultures. But don't take my word for it; look it up. Besides that, both of us, simply as North Americans, stand a better than even chance of having a touch of the Congo in us without knowing it . . . and there you are again. But even if both of us were Simon-pure North European stock, certified by the American Kennel Club, (a silly notion, since the amount of casual bastardy among humans is far in excess of that ever admitted)-but even if we were, such ancestry would merely tell us which cannibals we are descended from. . because every branch of the human race, without any exception, has practiced cannibalism in the course of its history. Duke, it's silly to talk about a practice being 'against instinct' when hundreds of millions of human beings have followed that practice."
                "But- All right, all right, I should know better than to argue with you, Jubal; you can always twist things around your way. But suppose we all did come from savages who didn't know any better-I'm not admitting it but just supposing. Suppose we did. What of it? We're civilized now. Or at least I am."
                Jubal grinned cheerfully. "Implying that I am not. Son, quite aside from my own conditioned reflex against munching a roast haunch of- well, you, for example-quite aside from that trained-in emotional prejudice, for coldly practical reasons I regard our taboo against cannibalism as an excellent idea . . . because we are not civilized."
                "Huh?"
                "Obvious. If we didn't have a tribal taboo about the matter so strong that you honestly believed it was an instinct, I can think of a long list of people I wouldn't trust with my back turned, not with the price of beef what it is today. Eh?"
                Duke grudged a grin. "Maybe you've got something there. I wouldn't want to take a chance on my ex-mother-in-law. She hates my guts."
                "You see? Or how about our charming neighbour on the south, who is so casual about other people's fences and live stock during the hunting season? I wouldn't want to bet that you and I wouldn't wind up in his freezer if we didn't have that taboo. But Mike I would trust utterly- because Mike is civilized."
                "Huh?"
                "Mike is utterly civilized, Martian style. Duke, I don't understand the Martian viewpoint and probably never shall. But I've talked enough with Mike on this subject to know that the Martian practice isn't at all dog-eat-dog . . . or Martian-eat-Martian. Surely they eat their dead, instead of burying them, or burning them, or exposing them to vultures. But the custom is highly formalized and deeply religious. A Martian is never grabbed and butchered against his will. In fact, so far as I have been able to find out, the idea of murder isn't even a Martian concept. Instead, a Martian dies when he decides to die, having discussed it with and been advised by his friends and having received the consent of his ancestors' ghosts to join them. Having decided to die, he does so, as easily as you close your eyes-no violence, no lingering illness, not even an overdose of sleeping pills. One second he is alive and well, the next second he's a ghost, with a dead body left over. Then, or maybe later (Mike is always vague about time factors) his closest friends eat what he no longer has any use for, 'grokking' him, as Mike would say, and praising his virtues as they spread the mustard. The new ghost attends the feast himself, as it is sort of a bar mitzvah or confirmation service by which the ghost attains the status of 'Old One'-becomes an elder statesman, if I understand it."
                Duke made a face of disgust. "God, what superstitious junk! Turns my stomach."
                "Does