I understand that an important part of parenting is setting boundaries for children. Until they reach a certain age, kids just don’t have the kind of foresight necessary to fully understand the consequences of all their actions, and letting preteens eat as many cookies as they want or stay up as late as they like probably isn’t the best idea.
That said, another important part of parenting is setting a good example. Fail to do that, and your kids are likely to just tune out everything you’re saying. Actually, that might be the best case scenario, since if you’re flagrantly guilty of not practicing what you preach, your kids might call you out for it, like one Japanese elementary school girl who pointed out her parents’ logical inconsistency in lecturing about keeping her video game playing to a minimum, even as they were glued to their own electronic devices.