OK, religious ideas are kind of genetic via indoctrination. (Epigenetic? Heh.)
Meanwhile ideas can be "self-removing" due to being bad, but then you'd just say "that's a bad idea" not "that's self-removing", so genetic descent was implied.
I didn't say the Shakers had a bad idea, it just was an idea that led to them removing themselves from further existence that was not genetic. Whether that was a good or bad decision is an entirely separate judgement call.