After the terrorist attacks in New York City in 2001, the number of traffic fatalities rose in the following months. Because of the increased fear of flying, people opted to drive more miles, which is statistically more dangerous than flying. As people made emotional decisions based on the fear of dying, some ironically made the exact choice that led to their deaths.
Although not as dramatic, many of our decisions birthed out of emotional fear can actually lead to worse outcomes than those we fear the most. When making decisions, fear can often force the wrong decision. Fear plays an important role when bear hunting, but not as important in most of your decisions.
Gut feelings, legitimate concerns and past experiences should be a part of making decisions, but leave emotional fears out of the process.