Well, incest is a topic discussed with some regularity in the comic, so if people couldn't discuss it on the forums we would be absolutely unable to engage with the text. So I feel like the answer to that should be obvious...?

If someone was posting, like, obvious incest kink posts about the characters, I would expect that to receive immediate moderative action, but that's because they're making people uncomfortable on purpose. Not because it falls on the wrong side of "proship vs. antiship". It's just an awful framework for talking about these kinds of topics.