Recently the New York Times Magazine showed a series of photographs of a rock formation in Yosemite National Park near Bridal Veil Falls. A prominent sign in yellow plastic was attached to the rocks which clearly said: "Danger. Climbing or scrambling on rocks and cliffs is extremely dangerous. They are slippery when dry or wet. Many injuries and even fatalities have occurred." One picture showed a woman walking on the rocks in a tight dress and high heels. Another showed a couple walking on the rocks. The man was carrying his dog apparently because he thought it was too slippery for the dog. Another showed a man carrying a month-old baby in his arms while walking on the rocks.1

What is it about people that causes us to ignore clear warnings? Why do folks rip the plastic cover off a pack o…