Disclaimer: I am not into incest. I find real life incest to be disgusting. As for fictional incest, while it is not as bad as some fetishes like vore and scat, I still find it to be disgusting. I have no particular opinion on Andy and LeyLey as I hadn't heard anything about the game before a few days ago and still know nothing about it outside of the incest drama on sites like here and the Sharty.
Incest is not like lolicon/shotacon, furry porn, or traps, where some of the people who partake in the fantasy fetish are also into real life pedophilia, beastiality, or autogynephilia. From my experience online, incestfags tend to have no brothers or sisters and tend to stay in the realm of fantasy. The few neckbeards that want to act on their weird incest fetish are either too chickenshit to act on it or immediately get rebuffed and disowned by their sibling and their family. On top of this, real life incest in the West is almost nonexistent, outside of sexual abuse situations between parents and children. Because of this, while incest is gross and definitely worthy of mockery, it is not in and of itself a danger to society and moralfagging about it is just virtue signaling.
That being said, I still think it's funny that Sharty doxed the creator, because again, incest is gross and people who are into it deserve to be mocked. Also, Sharty is a shitposting image board, not a beacon of morality or "le Anonymous leejun fighting against le heckin pedos". This is the same site that spams Twitch streamers with images of decapitated black children and Nikocado's butthole.
Likewise, Kiwifarms has historically not been a moralfag site. Sure, the Farms has worked to cancel or push for legal consequences on certain lolcows who commit horrifying crimes that bring direct harm to children or animals (e.g. The BMT thread, The Zoosadist thread, Nick Bate, etc...), but those cows are a very small minority on this site. Trying to act like an even more autistic version of Anonymous is not only incredibly gay and unfunny, but actually hurts the amount of milk produced. This is a comedy site where we mock and laugh at weirdos and degenerates, not try to destroy their livelihood (unless they're directly hurting children or animals).
tl;dr Mocking and doxing incestfags is funny. Trying to cancel and ween incestfags (and most lolcows in general) for some sort of moral reason is cringe and gay. Just laugh at them for being degenerates and move on.