The trouble with kids is that there's an element of random chaos in the decision making that cannot be accounted for and it's likely the fallout from those decisions that ultimately helps them develop the palpable and visceral sense against making them as they get older. I'm sure literally trying very hard to teach them the value of things helps, they do have the capacity to listen and learn after all. But the way I see it there's always a non zero chance that some totally different and bizarre thinking process will override all of that at random moments.