Now, this may seem counter-intuitive to anyone who spendsmuch time watching the news, let alone who knows much about thehistory of the twentieth century.
Are they suffering from potential availability heuristic (cognitive bias) here? Are they encouraging it in us? Just because we see violence on the news every day doesn't mean it's ubiquitous.
Apparently we'll need real evidence here to provide actual indications.
Does Steven Pinker provide archaeological evidence in his book? What are the per capita rates of violence and/or death over time?