A grim anniversary is upon us. On the morning of December 14, 2012, a troubled, 20-year-old male shot and killed his mother then proceeded to Sandy Hook Elementary School in Newtown, Conn. Among his arsenal, he wielded a Bushmaster AR-15 rifle, a semi-automatic assault weapon that is shockingly easy to purchase in America. In less than five minutes, he killed six adults and 20 children between the ages of 6 and 7.
I remember thinking at the time that if ever there were an event that...