>>2983264[short version]
because its an excuse to create & spend money
[longer version]
because economies are based on quantities & amounts of financial interactions, and waging a war involves a lot of financial interactions
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much similar is why they keep handing out welfare money to lazy worthless fucks who won't work for a living,,,,, because as long as you give a bit of money to a poor person, you can pretend to care about them to get votes, and yet they're too dumb to realize that they don't get enough money to save any of it. so all that they get, gets spent into the larger economy every month, driving the larger economy