I certainly don't resent the women who bring kids - I wouldn't say it inspires me or makes me feel good to see them either - to be perfectly honest - most of the time I have just been thinking about what I am about to talk about with the FS or nurse or whomever I'm there to see - looking at the smilign face or a child makes me smile - but I'm not thinking about the process that has occurred for the child to be there -- cause they may or may not have been through assisted conception -- and they may, or may not acutally be the child of the woman in the room....
I would think that if people are finding it difficult it is more about the head space they are in, obviously everyone who is in the place has experienced similar issues, and - as you said - is it not always possible to leave other kidlets at home.
As long as you are careful and respecful as much as possible - and try to keep the kids quiet (and preferably not with noisy kids videos (as one woman when I was waiting - which was irritating and annoying, cause everything else was so quiet!! - she needed kid sized headphones~lol)
most people will cope - and those that don't - well.... you can't protect everyone in the world....