Resentment grows from a sense of unfair disadvantage — what social scientists call relative deprivation: the feeling matters less as absolute hardship than as a perceived gap between what you have and what you believe you deserve or what others have. Combined with the in-group / out-group dynamics documented by Tajfel and others, this makes resentment easy to aim: point the felt gap at a specific group, and diffuse frustration hardens into targeted blame.
Cultivation is the operative word — the tactic doesn’t resolve the grievance, it maintains it. A wound is named, a villain assigned, and then the injury is kept perpetually fresh and framed as zero-sum, so that the out-group’s every gain reads as your loss. Shared resentment becomes the glue of belonging: the in-group is defined less by what it stands for than by whom it stands against. Engagement-driven media amplifies this because outrage and grievance reliably capture attention.
This is a core mechanism of extremist recruitment and wedge politics, and it feeds directly into grievance amplification (T7.23) and enemy-image propaganda (T23.6). Because cultivated resentment feels like justice from the inside, the defense is to interrogate the frame: check each blame claim against evidence and scale, refuse zero-sum stories, and ask who actually benefits from keeping you angry.