many commenters are pointing out that they don't understand what the opponents are saying

This is a little unfair; as soon as you take a deflationary stance on anything, you're saying that the other stance doesn't really have comprehensible content, and it's a mistake to turn that into a general-purpose dismissal of deflationary stances.

There seems to be very little real interest in finding out more (with a couple of notable exceptions). Instead the focus is on how to justify what is already believed without finding out any thing else about what the opponents are saying

If you think that's more true here than it is in other discussion forums, we're doing something very wrong. I understand that you're not able to spend time writing for this audience, but for those of us who do want to find out more about what moral realists are saying, every link you can provide to existing essays is valuable.