Methinks you've been sitting in your armchair too long.
Broad-based alignment doesn't come from nothing, but it is surprisingly easy to achieve when a population recognizes a shared stake. A synthesis between selfishness and altruism emerges when you consider who you can call a "neighbor".
> it is surprisingly easy to achieve when a population recognizes a shared stake
Sure. But it takes work for anything larger than a small, close-knit community. I’m pushing back on the notion that this comes naturally and is a default state. It’s not, at least not relative to people naturally forming in and out groups.
The armchair commenters are probably folks who have never organized a group of people before outside a commercial context.