This strikes me as too facile to be particularly useful. First, it's much easier to get a rough idea of how many people states have killed than markets, to be

This strikes me as too facile to be particularly useful. First, it's much easier to get a rough idea of how many people states have killed than markets, to be sure. But many wars are fought and nations are conquered (and, for that matter, created) for market-driven reasons: oil, tea, diamonds, slaves, to name a few egregious examples off the top of my head. Millions of people have died throughout history that would not have if states were not acting to protect, expand, or create markets. Second, while it's probably harder to get a rough idea of how many people states have saved than markets have, the number is not inconsequential. I certainly wouldn't suggest states are forces for unrequited good--there's copious valid criticism of them across the political spectrum--but I would suggest that they're hardly forces for unrequited evil, either.