Occasionally, a mass shooting incident is followed by interviews with the perpetrator’s friends, family, and neighbors who all say the shooter exhibited no dangerous behaviors. Such is not the case this week in Florida. Authorities had been called to the shooter’s house more than 35 times. “Neighbors said patrol cars were regularly in his mother’s driveway. More recently, Mr. Cruz, 19, had been expelled from his high school. He posted pictures of weapons and dead animals on social media.” A Lifetime of Trouble: Family Loss, Flashes of Rage. In addition to all the signs, “the FBI received a tip last month that the suspect in the Florida school shooting had a ‘desire to kill’ and access to guns and could be plotting an attack, but agents failed to investigate.”

+ For some reason, the White House refuses to release a photo of Trump signing “a bill that made it easier for people with mental illness to obtain guns.”

+ Mental health may have been a factor. But America’s biggest mental health problem is that we can’t pass sane gun laws. From AP: In many US states, 18 is old enough to buy a semiautomatic. And from the NYT: In Florida, an AR-15 Is Easier to Buy Than a Handgun.

+ My take (from yesterday): Play It Again, Uncle Sam: America’s Automatic Response to Semiautomatic Tragedy.