I think where you really see this is in any case where one group identifies another group that they perceive to be their oppressor and then having done so, imag

I think where you really see this is in any case where one group identifies another group that they perceive to be their oppressor and then having done so, imagine themselves to be justified in leveling a retributive response. (The example I used in another comment above was the mass enslavement and starvation of the kulaks in revolutionary Russia on the grounds that they had been oppressors of the proletariat.)