That depends on the situation, but if we’re talking about grade school, “gang-stalking” is really a form of bullying. Stalking the target as a group, however, very much feels like a game. In fact, the stalking may take on more importance than the person being stalked. One might even say that there’s a bit of primal instinct involved: The group finds excitement in stalking prey.
The point is that people love a good sense of outrage and hate feeling powerless. Gang stalking is a way for vigilante groups to empower their members to act as judge, jury, and executioner.