Linda on the Move had some good ideas about how to do that in the second linked thread, which I'm going to reproduce here:
1. Not responding to the offensive posts while waiting for them to be pulled. Working together to NOT quote or mention the inflammatory posts would help the thread no spiral out of control, and make it easier for the moderator to sort out.
2. Stick to discussing our actual children and real conversations we've had with them. If we stick with real experiences, there's just less to debate.
3. Left our political views aside. We all know that some people are pro choice and some aren't, we really don't need to know who on the board is each way. That's not the question. The question is -- "how do we explain this difficult moral situation to our children while they are growing up and learning about life?"
I also want to quote one of katelove's posts from that thread, because I think it gives us a nice framework for how to have this kind of discussion:
So, if you're explaining sexual intercourse and conception the facts would be penis in vagina, sperm meets egg etc. And will be the same for everyone (although different language variations obviously). The values are your beliefs on the matter ie. I thing only a married couple should have sexual intercourse and create a baby. Or, I think you should only have sexual intercourse with someone you love very much. Or, I think 14 is too young to be having sexual intercourse, I hope you will wait until you are at least 18. Or whatever your personal beliefs are.
I think, in discussing termination of pregnancy the dialogue should be exactly the same. The facts are the same whatever you believe. Everyone has different *values* and I don't see anything wrong with sharing those with our children. In fact I think it is really important to do so.
Please keep in mind that other posters may not share your values, and try to post in ways that are sensitive to these values, even if they differ from your own. For example, writing about "killing babies" or calling an embryo or fetus "a blob of tissue" are not okay, even if within your value system that's what you believe.
Ok, carry on....