Neil,
Just because people have higher values of what is right or wrong and like to look after their pride and joy, they should not be shunned off to an adult only site.
We work very hard and are proud to own a nice car and caravan and simply don't want them used as a goal posts, nor do we wish to use adult only sites as that would deprive us of caravanning with our 2 kids (9 & 5 years old) and all the enjoyment that that brings.
Imagine your excitement at getting away for your first trip with your family in your new shiny caravan and coming home with a dent in the side of it because someone couldn't be bothered with the "no ball games" rule.
How would that make you feel ?
Our kids love the fresh air, making new friends, the freedom and safety of the sites, but they do behave well and follow site rules.
We recently returned from a trip to Windermere C&CC site where we witnessed, at 2200hr a group of kids who's parents were not around, kicking a full weight football, over the roof of their caravan and letting it land amongst their neighbours vans.
Similarly, I have moved older kids away from my van when they were whacking a tennis ball at each other and I guarantee these are only a couple of many such examples.
Generally sites have a "no ball games" rule, for a very good reason.
A dent to a car or caravan is a very expensive repair and easily avoided by following a simple rule and using designated play areas.
If you cannot guarantee your kids will not accidentally kick a ball against someone elses caravan and follow a simple "no ball games" rule, then you might want to consider whether caravanning is really for you or at least consider taking out third party insurance for your neighbours to claim from.
Oh, and don't be too surprised when your comments get others backs up, they've all probably seen the damage done and with no recompense,
Ken.