The mentally ill gunman who shot and wounded two kindergartners at a small California school Wednesday wrote that he was deploying a “countermeasure involving child executions” in response to “America’s involvement with genocide and oppression of Palestinians” in a twisted note he left behind. The shooter, who turned the gun on himself after opening fire in the playground of the Feather River School of Seventh-Day Adventists, was identified Thursday as Glenn Litton, a 56-year-old homeless man who was sprung from jail just two days before the shooting, according to police. Litton, who was pronounced dead at the Oroville school, had...