I've heard of police officers doing the same with their service weapon.
That's true. There are police gun ranges that have a sign by the exit door that says "Is your gun loaded?", since many officers have forgotten to reload after qualifying or practice.
Maybe I should get one of those signs for my house
NRA Life Member | NRA Certified Pistol, Rifle & Shotgun Instructor | NRA Chief Range Safety Officer
".. a government and its agents are under no general duty to provide public services, such as police protection, to any particular individual citizen..." - Warren v. District of Columbia, 444 A.2d 1 (D.C. App.181)