It is important to set limits when they are young. I have seen too many people who have young children who are volatile, so they don't set limits. It's painful when the child gets enraged and goes completely out of control. So, the parents smooth it over, let the child do what he wants, and say they'll settle this another day. Unfortunately, that day doesn't come. When the child is a tween or teen, it's just too late. The parents have a massive problem, and worse still, so does the child.