“Sounds like the perp is a CRAZY, just as in the Tucson shooting.”
From the way his mother immediately identified him, I think you’re right. He was probably being treated for some serious illness that was carefully concealed. For some perverse reason, known only to him, he obsessed on Batman, just as Junior Hinkley obsessed on Jody Foster, went out, and converted that obsession into an atrocity.
I can’t help but wonder if the shooter called his mother just before the shooting. There are reports that a man talking on a cell phone opened the fire exit and propped it open and that the shooter then came in shortly thereafter.
The shooter’s car was parked a short distance from that exit. If the man with the cell phone and the shooter are one and the same, i.e., he went out the door to get dressed up and get his guns and then returned, who was on the other end of that call?