Why is the theme in Walk Two Moons judge a man before you his moccasins?

The theme in Walk Two Moons is not "judge a man before you walk his moccasins" but rather "Walk two moons in his moccasins before you criticize his life." This theme is about empathy and understanding. It suggests that we should not be quick to judge others because we do not know what they have gone through. We should try to understand their perspectives before we make judgments.