Opportunity knocked flat by 'defence'

Here's an good explanation of why defence spending is so obscene:

http://warisacrime.org/content/all-war-local

The concept is that of opportunity costs.  Money is finite (there ain't no golden goose) and if you choose to spend money on stuff that is only useful to destroy things, then you do not have that money available to spend on something useful, like schools, hospitals, roads, infrastructure, etc., etc.