For example, Robert Strange McNamara, the much-maligned Secretary of Defense during the Vietnam War, raised the issue of people injured in car accidents. He states: "Rather than worrying about what a passenger's head might hit if he were thrown in an accident, it would be better not to prevent him from being thrown at all" (148) . What he means is that people shouldn't think too much about this problem. Instead of considering all aspects before finding a solution, such as changing the material of the car, car manufacturers should make an easy change, applying seat belts to cars, like airplanes did. However, in the opinion of many people, simple solutions such as the one mentioned above are not the preferred method because they do not take into account all aspects, leading people to have a negative feeling. For example, some people are impervious and refused the innovation of wearing seat belts because they believed that wearing seat belts was tantamount to questioning the driver's driving ability. Simple solutions may not take into account human behavior to solve problems, leading people to question whether simple solutions are effective or not. Although simple fixes may have a higher risk of causing unintended issues, simple fixes have been proven to be more effective because they require less time.