Carol, this might be a stupid question. I'm still a little unfamiliar with this site. Are there no moderators other than the admins? It's human nature that people will disagree, and people will rub each other the wrong way. People get moody and emotional. Calling the site friendly can only prevent so much of this.
I would suggest selecting a couple of the long time responsible regulars to help you keep things in check. This is a large forum and you can only do so much. I'm on many different forums, and I know it's a large responsibility that you have. I'm sure you could use a little help. I'm not your guy as I don't frequent this forum enough but I'm sure there are plenty willing to help out.