[geofft]

I think this is true, and I think this is also the historically precedented answer. The partisanship in Europe in the early 20th century was not resolved by debate or belief, it was resolved by war and more generally political realignment. The vast divide between capitalism and communism was resolved by cold "war," by two superpowers aligning one with each and declaring the opposing ideology a security threat and then trying to starve out the other.

I think we can avoid another major war, but I don't think we can avoid one ideology winning and one losing.