"Combat deaths are seen as a measure of the magnitude and dangerousness of war, just as murder rates are seen as a measure of the magnitude and dangerousness of violence in our communities. Both, however, are weak proxies. Little recognized is how fundamentally important the medical system is—and not just the enemy’s weaponry—in determining whether or not someone dies. U.S. homicide rates, for example, have dropped in recent years to levels unseen since the mid-1960s. Yet aggravated assaults, particularly with firearms, have more than tripled during that period. A key mitigating factor appears to be the trauma care provided: more people may be getting shot, but doctors are saving even more of them. Mortality from gun assaults has fallen from 16 percent in 1964 to 5 percent today."
—- Better
Now that is an explanation for falling murder rates that I have never heard before. Freakonomics suggested abortion, and mayors and the police credit themselves.
Also, the book is phenomenal. Highly recommended.