Which of the following is NOT a category of hijackers?

The correct answer is that robbery-oriented criminals do not constitute a distinct category of hijackers. While hijacking can indeed be motivated by various criminal intents, including robbery, this motivation generally aligns with broader categories rather than creating a specific classification. The categories of hijackers typically focus on the underlying motivations for the act itself, such as psychological issues (mentally disturbed), ideological beliefs (terrorists), or specific objectives (goal-oriented criminals).

Mentally disturbed hijackers may use the act to express personal issues or grievances, while terrorists generally seek to further a political agenda, using hijacking as a means of publicity or coercion. Goal-oriented criminals are often focused on achieving a specific tactical objective, which could include hostages or demands for ransom. Robbery, while a possible outcome of hijacking, is more appropriately viewed as a motive that may fall under broader criminal intents rather than a standalone category of hijackers. This is why robbery-oriented criminals are not categorized as a distinct type of hijacker.