Hmmm! As a member of the BDSM and kink community for 18 years now, a former BDSM slave, AND as a life-long tickle enthusiast (-lee), I will toss in as well! : )
I absolutely LOVE incest role-play in my tickling stories. LOVE it. Not only does it NOT make me uncomfortable in the slightest, it is the whip cream on an already delicious tickling sundae for me.
Like an earlier poster said, which I wll build on, at least in the kinky community that -I- am part of, we don't kink-shame other folk's kinks. Which technically wasn't done here, at least in my view, since all of the people were just expressing their opinions on how it makes them feel, which are ALL valid, by the way... but it did get close to kink shaming.
The wall that my kinky group stay behind can generally be summed up as the wall between reality versus fantasy. There are any number of things that can be done in fantasy that are not only morallly wrong in reality, they would also be deadly. But people get confused by this. We see a LOT of new folks coming into the BDSM community who have read the "Gor" series of books... even engaging in online role-play with Gor themes before they decide to join us. They then visit their local real-life BDSM dungeon, expecting to find all the same things. How incredibly shocked are they, then, at being confronted with a TON of rules and regulations about boundaries, safety, respect, inclusion, MORE safety...and a long list of things that are absolutely forbidden, such as bringing children anywhere NEAR the dungeon, etc.. There's also ZERO alcohol or drugs allowed. Anyone breaking ANY of the rules is IMMEDIATELY banned for life.
All of the people -I- know in BDSM commmunity would be horrified by ACTUAL non-consensual activities. Of ANY kind. That's just not how we do things. Because actual kidnapping, and actual abuse is ALWAYS wrong. But that doesn't mean we can't engage in fantasies about certain activities, and even consensually act them out with other adults (as in "consensual non-consent" play).
So when the topic of incest role-play comes up, it can be a VERY hot topic for many people. But in my experience, it's that folks that have fuzzy lines between fantasy and reality have the most problems with this. When one's boundary between the two is strong and well-defined, then things become easy, safe, and fun.
Take our favorite kink of tickling: I'm lucky enough to have two tickle tops who tie me up and tickle me (or at least they did till Covid struck). And whatever they and I negotiate is fine betweeen us. But here's what happened when a forth person, who watched the first two and I publically play down at the dungeon, decided to spontaniously reach out and tickle me, WITHOUT my permssion, without ANY negotiations, without any thought beyond her own sadistic satisfaction. And we are talking about tickling for 1/4th of one second in time.
She has now been banned from the dungeon for life. What she to me she did in the community kitchen, where 6 people witnessed it, all 6 reported it, and she was immediately walked out.
Now... we see this EXACT sort of act (non-consensual tickling) in a TON of stories here on the TMF. Which is PERFECTLY FINE, as a story. Because it's not real. It's fantasy. No real persons were harmed during the making of these deliciously perverted tales. But once we are iin the real world, dealing with real people, an entirely different set of rules is employed. Which HAVE to be there. So, for me...for my community, it's like a switch: either we're in fantasy-land, where almost everything goes, or we are in the real world, where we have a narrow band of possibilities that have large responsibilities, rules, boundaries, and accountabilities to pay attention to, and to follow, attached to them.
So I am NOT squicked out by anything I read on here. It may not be my cup of tea, and once I see something I am not interested in, I immediately move on. But in my mind, I know there will be people on here who find that exact stuff, whatever it is, highly exciting. More power to them, I say. Because I've moved on to another story. Kink is like a make-it-yourself salad. You take from the stuff you want, leaving the stuff you don't, and voila! The perfect meal. Doesn't mean that other people aren't going to eat the spinach, the anchovies, and the benana pudding you left behind, however. Breaking taboos is one of the oldest, most exciting things we can do to stimulate our nervous systems. It's FUN.
It's delicious. It's satisfying.
As long as it's safe in all of the ways it should be safe.