> Oh, baloney. My grand nieces and nephews don't
> scream in public, for the simple reason it's
> not accepted.
And how did they learn it was not accepted? Presumably, they did it, and they were punished for it. And unless they are remarkable learners, they probably did it at least a couple of times before they figured out that punishment will always follow, and that they ought to cut it out. In other words, even if everyone applies what you consider appropriate discipline, you will always have children screaming at times, because they have to break the rules in order to learn that they exist. And I have no time for the anti-breeders who will use these occasions to slam all children and their parents, and to try and push their own child-free vision of the world on to others.
Actually, no, they don't have to misbehave before knowing they shouldn't. Personally, as a kid, I was told what to do in public before we ever left the house. In no uncertain terms!