<human>:  Why do people with a psychological disorder called death anxiety have a fear of death?
<bot>: People with death anxiety have a fear of death because they believe that death is the end of their existence. They believe that after death, they will cease to exist. This is a common belief among many people, and it is not necessarily a bad thing. It is a natural human instinct to fear death, and it is a natural human instinct to fear the unknown.