Combined, like Kew says, the idea of separate sections for adopters and birth family (because I suspect that's what you really mean by 'negative experience of adoption', no one who has adopted is going to describe their experience as negative) has been floated numerous times, and always dismissed. There are a number of birth parents/family members who post in the adoption board and are happy to do so. I hope that they feel supported and as welcome here as the adopters and adoptees. It just happens that adopters outnumber the other groups, that doesn't mean that they're not welcome here.
This board is for anyone affected by adoption - you don't appear to be affected by it, but seem to have an obsessive interest in it, which is why people are suspicious. It all smacks a little of rubber-necking. You've been told numerous times that people need to weight posters advice, and given that you have no direct link to adoption and won't say what experience, if any, you have of dealing with traumatised children, then you can't be surprised if your opinions are given very little weight. It's like me marching into a Middle East Peace Conference and expecting to be listened to because I once lived with someone from Iraq.
The very fact that this board is populated with all sides of the adoption triangle and every one manages to support each other and get on well shows that we're not the ones being argumentative and difficult - it's the busybodies with no link to adoption coming and telling us where we're all going wrong. There have been dozens of threads that I would describe as goady since I started posting on here a few years ago, many eventually get deleted, others eventually disappear down the list. We were removed from the active conversations list recently to prevent people wondering in here and dishing out advice without realising they're posting in adoption, and also to stop people starting threads whose only result was going to be a fight.
As for everyone being allowed to have opinions, that's fine and I think you'd be hard pushed to find someone who disagreed with you. The trouble is, you say you think 'birth mother' is distancing etc. then follow it up with In terms of formal language I do feel that there should be review which isn't just you saying your opinion differs to everyone else, you're saying our opinions are wrong and that there should be some kind of wholesale overhaul of the language we've all said we think is appropriate for our children. Do you see why people get annoyed?
As for not taking time to be more sensitive, perhaps if you don't have time to do it, don't post? This isn't a place for general debates about adoption. You're talking about our lives and our children. Would you go into the same sex parents section and start telling them how to do things, or the special needs board? I'm guessing not, because it would be offensive and hurtful. So perhaps you could try to afford us the same level of respect, please.