the most vulnerable
Serial means a series of crimes, usually one at a time, with a 'cooling off' period in between kills. The cooling off time depends on the individual killer. Jack The Ripper killed two women in the space of an hour. Some killers may not kill again for several years.
a rational is to tell why you choose the topic that you choose
Rational choice theory suggests that individuals have the free will to choose criminal or unlawful solutions based on their own rational calculations of benefits and costs.
As a general rule you don't; you do if you choose them carefully.
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A rational choice is a choice that makes the most sense by society's standards. For example, when given the choice between healthy food and poison, the rational choice would be to choose the healthy food.
As you shall see, serial killers are like not depicted as in the movies. Take for example Jefrey Damher. He was killed brutally with no strugle. Charles Manson was beat up in prison. Serial killers are killers because they choose the prey. In jail they are easy prey for vicious inmates.
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2 and 3/5 (A+)
The Killers was created in 2001.
Rational
The possessive form of the plural noun killers is killers'.example: The killers' photos were posted on a board in the courtroom.