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Originally Posted by IamKira
k, let me throw u a situation.. if i grew up w/ my sister and no other people around, eventually i'd develop my sexual organs and start having urges.. so your telling me i will just innately know that she is my sister and that having sex w/ her is wrong.. .... riiiiiggghht.... .. false, if i grew up being told by everyone that having sex w/ family members was the way things were done and i saw my family members acting in such a way i wouldn't hesitate to act as such... it is a social construct to act as we do in the face of incest.. and a good one (i am not in support of it because it can bring about mutated offspring).. if it didn't, i'd be more reluctant to immediately throw out the idea
Killer whales or orcas eat sealions
Polar bears eat seals.
Lions can kill other predators such as leopards, cheetahs, hyenas, and wild dogs, but seldom devour the competitors after killing them.
Wolves can kill pumas and other predators.
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Let me throw you a reality. They already Proved that it's not close genetics that factor into choices against incest, but close relationships, as shown in the Kibbutz study I cited and you completely ignored. Never mind the fact that if two siblings grew up in complete isolation, sex wouldn't factor in at all due to severe social isolation; you'd be more preoccupied with surviving than reproducing. As someone else pointed out, just because extreme circumstances can push people to it still doesn't make it ~normal~. It's an abberation, not a rule.
Also your ideas about what 'cannabalism' is, are skewed. A) Whales and sealions are different species. It's not cannabalism. B) Killing other predators and ~eating~ them are two wholly different things, so your other two examples are nonsensical when arguing about cannabalism. There are also, in addition to everything Colin pointed out huge biological incentives NOT to engage in cannabalism as a normal practise. There are illnesses that can be transmitted easily from person to person when the flesh is consumed, or even develop from doing so, even if the meat is cooked and digested. It happened in Papua New Guinea, with devestating affects on the population, and was directly caused by cannabalism.