An oppressed person in the examples given above can easily be an oppressor of others.

if we all go around with a victim mentality, it will be difficult to pin blame on anyone or indeed anything.

Bridge makes a short and pithy remark that is, for once, pertinent to this discussion. However, I would feel more comfortable with it if he put the word "perceived" in a couple of places in the sentence. Relativity has never been confined to physics. Even the sink estates referred to have a mixed economy. At the risk of sounding dramatic; in the valley of the blind the one eyed man is King. (And possibly oppressing the others.....)

(Just blending in with the tradition of abstract waffle.)