Some researchers believe there is no such thing as true altruistic behavior because they believe that

is motivated by self-interest                                                                        

Explanation:                                                    

Altruistic behavior: The term altruistic behavior is defined as an individual's unselfish concern for another person and often does things in a desire to help the other person irrespective of any obligation, loyalty, or religious reason.

A few researchers believe that an individual's behavior is being motivated by self-interest and referred to the psychological egoism.

Psychological egoism states that all behaviors of an individual are being motivated by self-interest that implies every action or decision of an individual is motivated through self-interest.

answer; which categories of people are most at risk of becoming a criminals;