[rootusrootus]

This seems more like a movie script expectation of what doomsday would be like. Doesn't history show that in most cases of natural disaster, communities tend to come together rather than devolve into violence? We always assume it will be everyone for themselves, everybody armed to the teeth, etc. Even in America I doubt that's how it plays out.

[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.