Final answer:
The need for power by a power/control killer stems from a desire to exert their will over others and can be rooted in psychology and societal dynamics, influenced by historical narratives of conquest and war, and philosophies of Nietzsche and Foucault regarding the ubiquitous and diffuse nature of power.
Step-by-step explanation:
The power/control killer needs power to exert their will over others, often to compensate for feelings of powerlessness or inadequacy in other areas of their life. Max Weber, a German sociologist, defined power as the ability to exercise one's will over others, which is a fundamental aspect of both personal relationships and governmental control. Historically, power has manifested itself through conquest or war, with the 'winning' side able to influence narratives and justify their actions. According to Friedrich Nietzsche, all humans desire power ('The Will to Power'), but not everyone chooses to exercise it, which can sometimes lead to a dynamic of 'Masters' and 'Slaves'. Yet, Michel Foucault articulated that power is less concentrated and more diffused, a network present in society at all levels influencing knowledge production and societal structures.