war economy isnt actual profit. the state gives out money to private contractors to fund a war which then gets money into the hands of workers. you might as well have them all unemployed and give them the money directly

at the same time the state is not spending money on things that would actually improve your economical situation in the long run, like investing into the education of your population, or infrastructure to facilitate trade and that all

why do you think the soviet union went to shit and the us is barely afloat with constant money injections from china. investing into the military is a short term boost to your numbers and nothing but bad for you in the long run.