Good to see your deep thoughts, my philosophical, anthropological comrade-in-arms! It was not surprised to see you got a facepalm from someone with "newbie" status. It goes with the territory whenever we delve into such territory.
I expect avoiding the inevitable backlash from those vocal so-called alphas, is another factor.
Exactly. Many feel we're living in a "megalophonocracy" where the loudest rules. (Greek megalofonos, loud)
Yes, it seems like it was just adolescent experimentation and didn't become pathological.
Yes, to do well in polyamory, one des need to let go of the need to have absolute control and predictability in one's relationships. In my own case, my long-time "nesting partner" decided she wanted to live with her other boyfriend in a "household of two," though she still loves me and we're trying to figure out what shape the future might take.
Triple deities/triun deities seem to pop up all across world history, but yes, my own familiarity comes from neopaganism.
One that is about her power and confidence, not corruption. I like it. Of course, you or any developer who made such a work would have to be ready for the onslaught. "The slings and arrows of outrageous 'alphas.'"
In fact, in many polyamorous communities, it is the woman who hold much of the power and opportunity. I've heard a few men complain that it wasn't what they expected. This is especially true of the newly poly couples. The wife finds a candy store of opportunities (especially if she is bisexual), while has to suffer with only one or two other partners.
I expect a number of us are in that place--it's not an interest in incest per se, but the exploration of the taboo and alternative ways of looking at society's standards. I did have to pause a little at your use of "anti-social." I had to see it as you talking about what mainstream society considers "anti-social," against the norms of society, as opposed to what the DSM V would define as anti-social. As a polyamorous neopagan with a toe in LGBTQIA+, I've seen how society wants to paint any "deviation from the norm" as anti-social.
Regarding the sleep sex--yes, in some ways, it feels a bit different than the classic scenario in these games. Yes, they are taking advantage of him, and the scene was pretty much required from the symbolic narrative. As with Lot's daughters, the primary motivation isn't to satisfy their own prurient drives, but doing so out of love and concern for their father (figure).
Unless one if talking about the corruption and mind control (pathological) cases, these characters could be seen as "the new libertine front." This is a good way to see the Haranson family--they are defining love and family for themselves. They are letting go of their fears about what society says is proper.
Apologies to anyone disliking that I turned Yoyomistro's wall of text into a great wall of text, but there were so many tasty tidbits in it!