No one likes people who bumble carelessly through life, never learning from the variety of mistakes they make. Such people are lost causes, and we instinctively know to stay clear of them. In contrast, we admire people who learn from their mistakes and strive to improve themselves. People—and readers—are forgiving of flawed people making mistakes, but only so long as they see what they did wrong and never repeat it. Show your characters shaking off their old selves and stepping into new shoes. This personal metamorphosis can be the biggest source of the education that your story provides.