I think they picked this because it's simply the most evident problem from the sum of all news, politics, literature and history. Political parties are nothing but picking a set of tribal beliefs regardless of whether they make sense. Democracies and oligarchies both have that in common. I don't see one single society that's solved it.
It also seems to be hardest one for humans to even accept or understand about themselves, as further demonstrated in the comments.
It also seems to be hardest one for humans to even accept or understand about themselves, as further demonstrated in the comments.