Final answer:
An active shooter situation instigated by a vengeful employee typically falls under workplace violence, often triggered by perceived unfair treatment. The key to preventing such instances involves ensuring procedural justice within the workplace and prompt reporting of warning behaviors.
Step-by-step explanation:
When a vengeful employee who believes they are being treated unfairly at work becomes an active shooter, this is most likely a case of workplace violence motivated by revenge or retaliation. Workplace violence can manifest in various forms such as harassment, threats, intimidation, and in the most extreme cases, homicide. Research suggests that perceptions of unfair treatment are significant triggers for such violence, and it's essential for employees to report any signs of intimidation or behavior changes that could precede violent actions. Preventative measures should be taken to ensure procedural justice and a fair working environment to diminish the risks of violent outbursts.