Imagine two ship crews marooned on opposite coasts of the same wild and inhospitable island.
One group drops seafaring formalities and coalesces around collective survival. They tend to each other, work together, and split what they have. Each person’s subsistence is tied to the other’s.
The other crew maintain their maritime hierarchy, compete for power and status, hoard resources—and ultimately turn on each other.
Everyone from the first crew survives. Most from the second group die from v

