Indulgent parents raise bratty kids. And then when they become brats (or much worse) as teenagers, and then deadbeats (or much worse) or adults, the parents wonder, "Where did I go wrong?" This ain't brain surgery, folks!
You don't let children do what they want to do. You make them do what they should do. better And then, as they grow older, you train them to understand why they should do right so that they will make the right choices on their own.