That wikipedia page is good.
I also think expanded notions of violence are appropriate, though excluded from Pinker's analysis. For example, if a rich country COULD provide equal, high-quality health care to all its citizens, but doesn't because the health care industry (hospitals, insurers, physician groups, pharma) lobbies against such outcomes, and excess morbidity and mortality result, that is a kind of violence, though one that Pinker is not interested in.
Or North Korea (or to a lesser extent China), which maintains relatively low levels of violence, but is simultaneously committing abuses against its population.
The idea that fewer people (or a smaller proportion of people) are smashing their neighbor's head in with a rock doesn't necessarily constitute absolute "progress" to me (though it would be a nice development... provided it was true... which it might not be).
I also think expanded notions of violence are appropriate, though excluded from Pinker's analysis. For example, if a rich country COULD provide equal, high-quality health care to all its citizens, but doesn't because the health care industry (hospitals, insurers, physician groups, pharma) lobbies against such outcomes, and excess morbidity and mortality result, that is a kind of violence, though one that Pinker is not interested in.
Or North Korea (or to a lesser extent China), which maintains relatively low levels of violence, but is simultaneously committing abuses against its population.
The idea that fewer people (or a smaller proportion of people) are smashing their neighbor's head in with a rock doesn't necessarily constitute absolute "progress" to me (though it would be a nice development... provided it was true... which it might not be).