[AstralStorm]

Communities yes, but they tend to toss out outgroups hard when they come for help. And then when a community can't deal with the change at all, it is more dangerous to others around. There are limits of what banding together can do in small communities.

Suppose the global trade is hit, you don't have enough food and growing things locally becomes impossible. Will you find someone brilliant enough to solve it in a small community? It's not very likely... War is more likely.