Hello...I have no children of my own, but I teach drama to 470 pre-k to 6th graders every week at a school. I find that children's behavior is often not nearly as bad as the adults with them. My experience at WDW has shows that parents often either excuse the behavior because they are too tired to deal with it, or are so tired that they discipline too much causing the child to then scream and cry because of this. Everyone is tired and hungry and things just end up a little crazy.
I think the main point to this thread was not that children should not be in the restaurant or that anyone doesn't want kids around at all - I think the point is simply, if you bring children to a nice restaurant, consider how they might affect others....not because they are children, but because you are the parent, and it's your job to teach them correct behavior in a restaurant.