I agree, but I would say the real culprit is ideology: left/right, liberal/conservative, etc.: it is all an artificial dichotomy. For that matter, it all goes to beliefs: whether a belief is sacral (theological) or secular (ideological), all beliefs breed divisions between groups of people: those who share this or that belief and those who do not.

The problem--up to now--has been that we have depended on beliefs (theological or ideological) to determine how society should be governed. An alternative now exists: an ethic of justice (a rule of conduct for governing the governance of society) that does not involve any belief, but follows from observation within material existence. As it happens, that ethic is mutual respect, which also follows from a belief in equality, which can be sacral or secular in origin.