In the entire horrible history of modern mass shootings, have government failures ever been so comprehensive and so heartbreaking as those that led up to school massacre in Parkland, Fla.? The FBI received a precise tip and failed to act. Local law enforcement was called to the shooter’s home dozens of times. Local law enforcement received a precise tip and failed to act. Many mass shooters wave red flags. The Parkland shooter did everything but call police and tell them the date and time of his attack. It would have been difficult for him to make his intentions more clear.