An angel of mercy or angel of death is a rare type of criminal offender (often a type of serial killer) who is usually employed as a caretaker and intentionally harms or kills persons under their care. The angel of mercy is often in a position of power and may decide the victim would be better off if they no longer suffered from whatever severe illness plaguing them. This person then uses their knowledge to manufacture the death of the victim. As time goes on, this behavior escalates to encapsulate the healthy and the easily treated.
Some people with a pathological interest in the power of life and death tend to be attracted to medical professions or acquiring such a job. Medical professionals will kill their patients for money, for a sense of sadistic pleasure, for a belief that they are "easing" the patient’s pain, or simply "because they can". --Wiki
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