There is a dichotomy on the left between the sheeperals and those who consider themselves to be the elite.
Cui bono may be “who benefits”, but that benefit is different for each of these groups.
Sheeperals, as I said, benefit by getting their self-righteousness.
Elites, the truly evil, benefit by eliminating competition for resources.
Cui Bono as you noted, can benefit different groups and at different levels. Real levels and perceived levels, again as you noted.