Wonder if the shooter had a bad experience with the TSA at some point.
Only if he had ever flown in the last ten years.
Are all the terminals at LAX similar? The one(s) that I have been through, unless you are one of those platinum gold super priviledged flyer folks, you have to go down a long zig zagging underground tunnel to get to the security check. It's like going into a dungeon prison ("abandon all hope...") and ALL of the TSA agents were fat and black.
I guess he could have shot his way through the upper floor security, but they have a bunch of folks screening out all the peasant flyers before you can even get in the line