Specifically, see here:
Why is this inappropriate when posted in the backyard? Given there was already a thread about Incest and Paedophilia with regards to the German government? I certainly wasn't advocating incest, and I was soliciting a serious viewpoint from people as to why we have laws governing the behaviour of consenting adults in this situation, as I plainly said in the thread.
In the context of backyard discussions, I certainly do not think this is inappropriate.
While the closer may have strong moral views against it, this doesn't mean it should never be discussed. The reason given for closing was
"I don't think we need a thread about incest."
Well, we don't per se need a thread about anything in the backyard. But as a topic, I believe it is every bit as interesting as many others there.