It is Resentment that the Establishment uses to control us, and to keep us focused on the material world.
The first (attempted) major socio-political movement to come after the massive collapse of Western Christianity in the 19th century was Nationalism; which was a movement of Resentment, originating in the lower-upper classes; the high school teachers, journalists, clerks and others clinging to the margins of the ruling elite.
For a while, some Nationalist movements could create cohesion and motivation by inculcating a belief that prosperity, power and pleasure were due to if The Enemy could be thwarted. Nationalism worked best (albeit always temporarily) when there was such an historical enemy - a perceived 'oppressor', and not very well when there wasn't.
But at a deep level Nationalism is untrue, and indeed a lie; because it is materialist - that is, its implicit claim is that if material things can be sorted-out - then life will be Good (or, at least, as Good as Life can be...).
One would have supposed that the fact that is was Not true, and that material prosperity in the absence of spiritual meaning led to despair and nihilism ought to have been recognised by 1965 at the latest - since that recognition was the currency of much public discourse across the whole of The West from the middle 50s - Existentialism, the Beat generation, the 'Angry Young Men' etc.
My understanding is that the (evil, demonically-controlled) Establishment recognised the danger of a spiritual, ultimately Christian, rebirth; and decided to manipulate Western societies into mutual resentment; so people would be focused on the lie that 'if only' they could escape oppression (by the 'Bourgeoisie', men, white people, The English, Christian churches, 'heterosexual' married families, or whoever) then life would be... well, Good Enough.
Half a century later - we have never been less spiritual, less Christian, less Romantic - and almost everybody in The West is seething with Resentment against some group, or many groups.
To 'fix' the source of this Resentment in some material, literal fashion is, for almost everybody, the number one priority - but there are so many number one priorities that the societal quest is futile/ deceptive/ obviously-manipulative.
And if ever it was achieved in any single domain (which attainment could/ would, anyway, never be acknowledged) then such people would find themselves no further forward than The West circa 1965: a state of meaninglessness, purposelessness, superficiality - and despair, nihilism and death.
So beware making Resentment your guiding motivation - no matter how justified it may seem, no matter if it is (apparently) wholly-justified... because it is a demonic deception, the path to death and despair; and Resentment will seal you off from the true happiness of Life.
Note: We all feel Resentment, and none can truly prevent its emergence - especially in this world. But all Christians can repent what cannot be prevented - and Repentance of itself places resentment in a subordinate position in your life - and thus neutralises its ultimate evil.