> Due to the economic restrictions of Poland under the communist regime, Lem was unable to give Dick his due royalties. Surely losing out on this potential source of income, regardless of reason, would incline Dick unfavourably towards Lem

If we pull aside the ideological grandstanding what we see is plain old jealousy, resentment and vindictiveness. That’s usually the case in any context. The ideological grandstanding is just a fig leaf.