Author Paul Barrett discusses his book "Glock: The Rise of America's Gun" on PBS, noting that gun violence in the U.S. has actually decreased sharply since the 1990s. Despite the number of guns in the country doubling from 150 million in 1970 to 300 million today, violent crime rates have halved. Barrett attributes this to shifts in policing and higher incarceration rates, while the hosts point to the deterrent effect of legal carry laws.
