We error as human beings. That is our nature. But the world today requires objective opinions and decision-making. As human, we are governed by our emotional states, personal wants, our psychology, and physiology. We are, in fact, fallible to achieve non-biased opinions and thus a proper decision-making. Many things can factor into how we make our decisions--gut feeling, logic, weather, emotions, etc--but how can we justify that the decision we make is fair if we are not removed from all those factors that potential play an influence on our mind?
Perhaps what make us fallible are the thing that make us both strong and vulnerable.