Yesterday Panera Bread became another restaurant establishment asking customers to leave their guns at home, joining eateries like Chilis, Starbucks and stores like Target after pressure from anti-gun groups. Like other restaurant chains, Panera's official policy hasn't changed to an outright ban, but they've made clear customers carrying firearms for self-defense aren't welcome. This "please leave your guns at home" policy is catching on, but as more restaurants join Panera and others like it, it's important to remind them of the horrifying Luby's Cafeteria massacre. In 1991 Texas residents were banned by law from bringing firearms into restaurants. That same...