I am very thankful for my parents to let me fail over and over again. My father was quite blunt about it. "What is the point of crying. Pick up yourself and keep going." School of hard knocks. But he did intervene, if he thought it was danger to my well being. Playing with chemistry set can get dangerous. :-)

Kids need to learn that its okay to fail. Many a times, going over the line/edge is what it takes to learn.