This reminds me of this quote from Jill Tarter of SETI, specifically the last sentence:
“Might it be the discovery of a distant civilization and our common cosmic origins that finally drives home the message of the bond among all humans? Whether we’re born in San Francisco or Sudan or close to the heart of the Milky Way Galaxy, we are the products of a billion-year lineage of wandering stardust. We, all of us, are what happens when a primordial mixture of hydrogen and helium evolves for so long that it begins to ask where it came from.”
source: https://www.ted.com/talks/jill_tarter_join_the_seti_search (@ 3:02)
I think this is not too difficult for humans to comprehend, it just doesn't address the resource appropriation and geographic property claims on this planet. Aside from generational interest, conflict areas tend to have something obviously appealing about them, so there's nothing that a bigger picture nihilism helps with.
Too idealistic view on human nature. We discovered vastly different cultures in the past, no hint of humility (rather exact opposite) or bonding, unless we find a common enemy.
Taken cynically though, is this quote not simply describing the ultimate common enemy?