Nothing wrong with kids behaving like kids when they're at home, or in a playground, or at a chain restaurant. But there's a bunch of other places kids don't belong. Like proper restaurants, the opera, strip clubs, etc.
It's interesting that some parents are so inconsiderate and feel so deserving that they can't seem to fathom the fact that a proprietor might care more about the interests of their clientele as a whole than their individual custom. Demand usually far outstrips supply for good restaurants anyway, so it's hardly like they'll miss your business - although I'd imagine a "no-kids" policy would only increase custom anyway.
