"Society made me do it"

[PJgunner]

"Court records show that Rollins admitted to shooting Brashear and that he led police to the assault weapon used."

Just which assault weapon? Most assault weapons are just a bit awkward to bring into play from a cae or even in trying to get out of the car, unless you have it in such a manner as to make it readily accessable, like it's sitting on your lap with the muzzle pointed at the door.
I think I have to agree with Gumpokc that there was no temporary insanity. Introduce the bum to "Ol' Sparky".
Paul B.