Human beings still judge poorly in their own cases. They still deceive themselves about their own righteousness. They still fool themselves into believing that their motives and intentions are pure when pride is really what’s driving them. And when these traits are amplified into collective (communal, political, national) endeavors, the logic of self-interest becomes overwhelming and inescapable.
Prideful self-regard is woven into the very fabric of our fallen world. In particular cases, an individual can act out of authentic self-abnegating love for another. But as a group? That is nearly always impossible, at least in this vale of tears.
Which is why Christ taught nonviolence — and Christianity should preach pacifism and the renunciation of political rule.