I don't understand what's going on here. It's a D&D setting, why does everyone expect it to make sense according to man's history? Have you guys ever played D&D in a custom setting, or even in a standard one? I know many of you have, so this entire discussion baffles me. Usually, when you create a custom setting you start from a particular idea and try to expand on it, following a chain of causes and consequences as much as you can. But obviously, since we aren't professional writers, something has to slip up. More often than not, for every detail that makes sense, ten others wouldn't be justifiable even in a million years.
Yeah, medieval people wouldn't behave that way. So? Medieval people didn't live in a fantasy setting whose only purpose is to give people a chance to explore interesting ideas.