The Economist have produced a chart showing the cities with the highest homicide rates - the majority of them are in Latin America. Which prompts a question: which kills more people each year, murder or war? You know the answer when you think about it. But the really disturbing thing is that some countries have got murder rates that are so much lower than others (even when you choose countries of similar wealth) ... so we already know how to fix this. While murder seems so individual and small scale the world of risk and big data suddenly makes it look like something else: both reasonably predictable, and reasonably preventable. When something like that is permitted to go on then more questions should be asked, and more done to stop it.