Plenty people build something other than killing machines. And not caring about it is a convenience perspective, afforded by circumstance of living in a well-defended nation.
That's what they want you to think. The war machine is a jobs program, but they could just as easily spend the same money on something more useful like infrastructure projects or social programs.
Well, you're both right. In that the purpose of all this military spending is to make the world safe for Dow, Exxon, and US Fruit, and people who live in the imperial core get cheaper prices because of it.