One key indicator of right-just anger verse self-seeking anger seems to be timing.
Self seeking anger is quickly roused. It is regular. Right-just anger is slow, patient, only dressing for battle when there is no recourse. It is rare.
Self-seeking anger holds on, grinds its teeth, shouts about its own dignity. It is sticky. Right-just anger is quickly relieved. It does its work of reconciliation, then quickly retreats. It is surgical.
One diagnostic question for anger, then, is: “What are its mechanics? Is it regular, or rare? Is it sticky, or surgical?” Apparently, that tells us a lot.