No, I'm pretty sure there are not always "bad people we need to shoot at". Indeed, I'd be fine with just shooting at the ones that came over here. If the Department of Defense was more on the defensive, rather than trying and failing to be the world police, that'd be cool.
Ah, so the broken window fallacy is completely ignorable if there is a middle-man. While it's a complete waste to have the glazer make a new window, the money the glazer pays the coal-man to keep his furnace going, THAT'S totally legitimate commerce!
No, that's silly. It's wasted effort, wasted resources, and the broken window is a drain on society.
Some military is always needed, but we don't need THIS MUCH military. But that's a bit of an aside. My point is that claiming that the military provides a welfare service to the poor by providing them jobs is an empty argument. Likewise, claiming that military contracts produce economy is also an empty argument. If you want to piss away money employing people to create software, uniforms, vehicles, and support infrastructure in a welfare/make-work/might-as-well-toss-it-into-a-volcano sort of way, I'd rather the output of those efforts be something more useful like software, uniforms, vehicles, and support infrastructure for the healthcare system?