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If they did, the World Wars proved the point, such conflicts are in nobody's interest.

IMO the world wars proved that MAD is the only brake on open conflict.

Was the US not better off after WW2?

Bet it won't be better off after WW3. Nobody will except maybe some primitive tribes in forgotten places.

It was better off because it didn't have its major industrial cities firebombed while every other country did.