There is a certain insect that bites people every year, and the people who get bitten contract a disease that has a high fatality rate. However, a new bug spray has been discovered that is chemically safe and is scientifically proven to prevent most of the insects from biting you, thus dramatically decreasing the number of people who contract the disease and the people who die from it. Because if this, the life expectancy of the general population has steadily increased. As an added benefit, if many people spray the bug spray, it protects those who cannot or have not sprayed it. However, a very small, insignificant portion of the people who spray the bug spray develop a freak allergic reaction. Due to this fact, the bug spray is bad.