Some people would argue that we don't do a very good job. But taking the long view, that is clearly not true. Consider the historical trend in homicide (not including wars), which is both the most reliably measured crime and the best barometer of a society's overall crime rate. These statistics, compiled by the criminologist Manuel Eisner, track the historical homicide levels in five European regions. The steep decline of these numbers over the centuries suggests that, for one of the gravest human concerns--getting murdered--the incentives that we collectively cook up are working better and better.