Veterinarians like to say that there are no bad dogs, only bad owners. I think the same can be said for kids. If you see a kid behaving outrageously, it's usually a safe bet that there's an irresponsible parent neglecting his or her duties somewhere in the cabin. When it comes to air travel, there are no bad kids, just bad parents. I promise you that ten years from now when you are traveling with a couple of kids in tow, you'll cringe at even your mild rebuke of parents.
Experience is the only teacher when it comes to parenting.
Children who travel today will become the actively traveling adults of tomorrow, while kids who don't travel won't be as inclined to do so when grown. And, yes, my kids are good travelers - we even get compliments, so I know it's not just me. I've always said that other than a love of reading, the best gift you can give your children is a love of travel. Your point's well taken. I'll never know what it's really like to travel with a baby until I have one of my own.