The point is that the social fabric is already rather thin. About the only thing most people can agree on these days is not killing each other and in America even that's not a given.
No shared culture, no shared religion... Some countries like the UK have a monarch to rally behind but that's an inconsistent glue at best.
Basically, our lack of extremism makes us vulnerable to extremism. Kinda "virtue is a double-sided sword" situation.
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