Fear is one of the most primal of human emotions. The biological mechanisms that produce fear are buried deep within a portion of our brain called the amygdala...a portion which has been dubbed "the reptilian brain" since it has been present since the age of dinosaurs and predates other brain structures responsible for emotion and logical thought. Indeed, all the brain structures responsible for "higher" thought are built around the structures responsible for survival instinct. Fear is an integral part of being human and neccesary to our survival...except when it seeks to dehumanize...
In the national debate over homosexuality and its equal treatment under the law, fear is often evoked in an attempt to make us look like we are mindless monsters bent on destroying all life...dont believe me? Take a look..