A good article Tim,
I did like the point about making things to blow things up not being economic growth. It made me think as to whether or not the arms trade is contributing to growth or not. Is the net effect of the arms trade on the global economy a positive or negative one? On one side we have the obvious advantage that we've made something (for example a bomb), on the other hand we've got the disadvantage that it will ultimately destroy something. In between we have the potential advantages/disadvantages that our "will" is being enforced, and we perhaps get global security.
I suppose it actually comes down to a basic question of "is it ever necessary to fight a war". Still, got me thinking, which is sometimes a good thing.