It's an emotional issue

"Emotions are about the life of an organism, its body to be precise, and their role is to assist the organism in maintaining life…emotions are biologically determined processes, depending upon innately set brain devices, laid down by long evolutionary history…The devices that produce emotions…are part of a set of structures that both regulate and represent body states…All devices can be engaged automatically, without conscious deliberation…The variety of the emotional responses is responsible for profound changes in both the body landscape and the brain landscape. The collection of these changes constitutes the substrate for the neural patterns which eventually become feelings of emotion."

The biological function of emotions is to produce an automatic action in certain situations and to regulate the internal processes so that the creature is able to support the action dictated by the situation. The biological purpose of emotions are clear, they are not a luxury but a necessity for survival.

"Emotions are inseparable from the idea of reward and punishment, pleasure or pain, of approach or withdrawal, of personal advantage or disadvantage. Inevitably, emotions are inseparable from the idea of good and evil."

Emotions result from stimulation of the senses from outside the body sources and also from stimulations from remembered situations. Evolution has provided us with emotional responses from certain types of inducers put these innate responses are often modified by our culture.