[csmsss]

On Friday night, Vargas set a combustible liquid on fire in his apartment, sending the unit into flames, police said. Building manager Italo Pisciotti and his wife went running toward the smoke. Vargas opened his door and shot and killed both of them, Lt. Carl Zogby, a spokesman with the Hialeah Police Department said.

Vargas then went back into his apartment and began firing from his balcony. One of the shots struck and killed Carlos Javier Gavilanes, 33, who neighbors said was returning home from his son's boxing practice.

Vargas then stormed into a third-story apartment, where he shot and killed a family of three: Patricio Simono, 64, Merly Niebles, 51, and her 17-year-old daughter.

I don't see how this sequence is much of an argument for keeping a firearm on your person at all times inside the home. He didn't invade anyone's home until well after his rampage had started and multiple shots had been fired. Anyone who wasn't asleep likely would have been alerted to the racket outside long before he broke into the other apartment.