Final answer:
The statement is false, as an accessory is not the main actor in a crime but is someone who assists the primary perpetrator; the main actor is known as the "principal". The provided scenario demonstrates the Prisoner's Dilemma faced by accomplices involved in a crime.
Step-by-step explanation:
The statement "An accessory is one who is the main actor in the commission of a crime" is False. In legal terms, an accessory is someone who assists in the commission of a crime but is not the primary perpetrator or the "main actor" of the crime. The main actor in the commission of a crime is referred to as the "principal". The scenario provided is an illustration of a psychological dilemma faced by accomplices, known as the Prisoner's Dilemma, where suspects must choose to either "defect" and inform on their accomplice to gain a lesser charge or sentence, or "cooperate" with each other and not inform, potentially risking a harsher sentence for both.