The mother of the man who killed nine people and himself at Umpqua Community College in Oregon last week wrote extensively on social media about her love of guns and her difficulty raising an autistic child, the New York Times reports. Laurel Margaret Harper, mother of gunman Chris Harper-Mercer, wrote that she kept AR-15 and AK-47 semiautomatic rifles and a Glock handgun in their home, and cited her son as her source on facts about gun laws. Writing on Yahoo Answers under the name TweetyBird, she mocked “lame states” with tough gun-control laws, and said that because of the multiple...