Comment by tremon

"Every neighbourhood" is still a local problem, and can be solved locally. A grenade-lobbing device in australia can not reach 1 Microsoft Way, Redmond with multiple hits per second, nor do we have the resources to produce such artillery at the rate of multiple per second. Any analogy that you want to extend into the real world has to acknowledge these real-world limitations in more than just a footnote, or it's not a useful simile.