Can you make some examples of war where fighting itself was the primary goal?It's possible that we're seeing one now in Ukraine. The Russian army isn't exactly made up of economic elites, being composed largely of men from outlying territories who are either a possible long-term threat to Putin's vision of Soviet-era revanchism or impoverished people who are literally more trouble to feed than they're worth. From Putin's point of view, a meat grinder may be just what the (mad) doctor ordered.
Certainly that dovetails with Kim's motivation to send his own hungry soldiers to the Ukraine front. Now that he has nukes, what does he need such a large army for? Like the ragtag derelicts and criminal elements who make up the Russian armed forces, those troops are more of a liability to Kim than an asset.
See also concerns about China's surplus of young men who will never find mates thanks to the effects of the regime's one-child policy. A literal incel army. It's not hard to imagine that Beijing might find a war to be a convenient way to rebalance the population and remove a potential source of agitation.