Security is a grand thing, but our over-doing of it oft leads to unfortunate lapses....
There's news that a report bearing an official City of LAX imprimatur maintains that the fatally wounded TSA agent lay bleeding to death for up to 30 minutes, while the terminal was being "secured" by LEOs who kept paramedics outside away from the victim.
I presume the world in which I grew up has gone, all those tales of soldiers, marines and sailors who in the face of enemy fire retrieved their wounded. Joe Friday's long retired, so I don't expect the LAPD is into that level of risk either, and I guess that the unarmed TSA agents didn't stick around for casualty evac.