It has been shown that possessing a gun can change how one thinks. There has been ample evidence of this and this is just another example.

Interesting aside regarding the shooter in San Diego. I read he was a Iraqi veteran who suffered from PTSD. Why do we allow people who have a mental condition they get compensated for to have a gun. Some will say because he is a vet which should have nothing to do with owning a weapon and being mentally incapacitated. I also read that a couple said that god was looking after them as they came late and avoided the carnage (who's dumber the shooter or a potential victim?) At a gathering we held recently about guns and in which some gun owners showed up a comment was made by one who has and knows about guns about the AR-15 used in the shooting. He said this was a cheap gun but was full of problems and not dependable. The report said the gun jammed otherwise more would have been shot.

Oh dear! Remember the FBI agent who was dancing and his gun went off? Can we trust no one?