I don't think benefit is a strong enough restrictions. "War" is just a euphemism for "mass-murder campaign", so it should never be waged, except to defend against foreign aggression.
I think there should be other ways of negotiation in this time and age.
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There are other ways, but the sociopaths in charge don't care about the costs of war, since other people end up paying them.
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They just care about the profits they can make from supplying the war.
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