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In addition to genetics, incest raises the issue of mixing sexual relationships with power relationships and raises the question of consent, especially when young. Same-sex marriage is taboo because half of our population is brainwashed into thinking that a bunch of paper from thousands of years ago represents the will of some invisible sky wizard. Polygamy is taboo for the same reason as same-sex. Both are stigmatized because people feel it's their moral obligation to do so, and because of misunderstanding. Bestiality is wrong because there is no way to obtain consent from an animal with sub-human intelligence.
Incest has demonstrably negative consequences. Bestiality is unethical. Gay marriage and polygamy are just things that most people don't understand or want to understand.
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