Comment by gste

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.