Incest isn't any morally wrong than homosexuality. A lot of common points made to defend homosexuality can be applied to incest. Outside of pregnancy, there is no valid sound reason to hate incest and even then, the pregnancy argument is quite dicey. It becomes further dicey when you introduce fiction.

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1. Homosexuality and incest are rare in humans. Because it's rare, it's even more ridiculous to be concerned with it.
2. Animals and humans are biologically made to avoid incest and homosexuality. Imagine if early humans were mostly homosexual or mostly did incest, the human population would have died out.
3. It doesn't concern anyone. What people do behind closed doors has nothing to do with you. It's not good to try and control another person's lives because you got offended by it. ​

Yeah, fuck the mod who deleted my comment. Fucking pussy.