As is always the case, there's more to it that one example. For every example of incest between brother and sister, there are examples of father and daughter, mother and son, etc. My reaction of disgust is not really to brothers and sisters, but parents and children. In this case, even if it's not "forced", it's a position-of-power abuse. The 'adult' is supposed to know the difference between right and wrong, and shouldn't be using their power as the adult to make the child do something they don't want / can't consent to do.
Even as I'm in favor of same-sex marriage, I have to agree that brother-sister incest is not terribly different from same-sex ...sex. Both have been historically shunned, and both prevent effective reproduction of the species. In the case of same-sex sex, no child can be created by the intercourse, and in the case of brother-sister sex, the progeny created by intercourse is very likely to have defects or die before / during birth.
I don't think that "Can this result in a viable child?" should be a good litmus test of whether we allow or disallow a sexual relationship to exist; after all, pedophiles and their victims can create successful offspring, but that doesn't make it right. And men and women chose to participate in things like anal sex, which also don't represent successful offspring.
Whatever we decide to do with either, we shouldn't be basing our decision on whether it 'furthers the species'. As I showed above, it's not an effective test, and quite simply, we're not exactly in a population shortage at the moment. If anything, we should be encouraging activities which DO NOT result in children.
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