Guns Are Rarely Used in Self-Defense

[jimmy the one]

18. illegitimate DGUs, legitimatized

Didn't George Zimmerman ultimately qualify for a DGU for shooting Trayvon Martin? If not why not? who should I check with? Kleck? Lott? which gun guru for hire?
Is that the kind of DGU's which mix in with the more bona fides?
And how about this most recent killing of football player will smith; there's surely to be a struggle for his killer to get a DGU for shooting him several times in the back, eh?:

Police say former New Orleans Saints star Will Smith had a loaded gun inside his vehicle on the night he was shot. New Orleans police said they found a 9 mm handgun in Smith's vehicle.
They also said they found a loaded revolver inside the vehicle of the man accused of shooting Smith, Cardell Hayes. But police said there was no evidence to suggest either of those weapons was fired during the shooting. Police say Hayes shot Smith with a different handgun..

An unnamed man who says he witnessed the argument, giving his version of events. 'I guess this guy {will smith} was like, "Get out of here or I have a gun,'' and he {killer} goes, "F*** y'all, I've got one too." And he grabs the gun and then he shoots him the back – dead.'
http://www.dailymail.co.uk/news/article-3535833/Dramatic-video-shows-moment-football-player-Smith-rear-ended-car-drove-hit-run-just-moments-shot-dead.html#ixzz46wzIVBOL

Will Smith was fatally shot in the back in what police called a deadly act of road rage. .. defense attorney for Hayes, says there's more to the story. He says Hayes himself had been rear-ended moments earlier by a hit-and-run driver, and called 911 to describe the car he was following before he ran into Smith's Mercedes.

So the defense plan is pretty plain to see: Killer justifiably shot will smith since smith said he had a gun in his car, corroborated by witness, and as smith was going back to his car ostensibly to get his gun, Killer shot him in the back in a preemptive strike to prevent Smith from returning back & shooting back at him as he threatened.
I wonder how many of those 'legitimate' dgus, are like this? ergo, not so legitimate.