. . . and not by the justice of their cause, in case anyone wondered about
> that . . . .
>
A transition between historical stages has nothing to do with abstract notions of "justice." If Marx was ever right about anything, such a progression will rather entail a shift between the moralities of different ruling classes.
-- "Hige sceal þe heardra, heorte þe cenre, mod sceal þe mare, þe ure mægen lytlað."