Though not in retail or the customer service buisness, I feel your pain for "little darlings". Are there accident where the kid does something he shouldn't sure, But when a parent lets them do something wrong that's another thing. If you bring your 'little darlings' out to the store and they can't act right then it is the parents fault and they should disapline them. I remember when I was a kid there were certain stores I had to keep my hands in my pockets to ensure I wouldn't touch/break something.
Gueess I'm just a complainer but when I go to a store and there is a child misbehaving (ie banging on the glass on a fish store) I will say something; trying to be nice. If they continue to misbehave I will tell the parents. And if they are there watching the whole thing man will I give them an earfull.
But you started the retail buisness for a reason. Don't let a few bad apples spoil the buch.