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I think people are only willing to admit this because they're anonymous. Give the pro-incest guy a face and he'll vanish in a heartbeat.
That said, brother-sister incest seems to be the very last line in a long list of sexual deviancies; even beyond bestiality and pedophilia. Do I think humanity will ever reach this point where incest will become a common practice? No, but remember we've only been around for a few thousand years, and homosexuality became acceptable in the last decade or so.
I have no idea what's going on in that comic.