>>17847106 (OP)Because in a revolutionary mindset any opponent of the current power structure is not only a natural ally but also morally grey, as any judgement given by the current power structure is naturally suspect.
This is why leftists also have a bias against death penalty above the ones regular people have through, y'know, not wanting to die themselves and projecting to someone else; because every single criminal executed is one less penal soldier you could "pardon" in exchange for revolutionary manpower against the state that unjustly imprisonned them.
tl;dr it's human resources