It would be one thing if "Stand Your Ground" laws were actually enforced as written, and that would be insane enough - they basically put the legal value of one person's life in the arbitrary hands of another, and blame any victim who happens to stray into the sight of a bigot or a paranoid with a gun. But they are not enforced as written, because they don't work in the other direction: A normal person going about their business in good faith who feels threatened by a bigoted nutjob with a gun is not extended the same impunity to deal out "frontier justice," especially if the shooter is black and the corpse isn't. Had Trayvon Martin been found standing over the body of George Zimmerman under identical circumstances - i.e., deliberately stalking an unarmed man and then gunning him down in cold blood - he could very easily have been charged with 1st degree murder and sent on a prosecutorial express train to Florida Death Row.
This fact would be slightly less horrific if it were something new in the states that have these laws, but it seems to be nothing more than a continuation of the Jim Crow "lynch culture" that made being suspected of something - anything, really - a capital offense for black men, while those who openly murdered them and terrorized their families were completely immune from local or state-level prosecution. In these states, the law isn't the law: Privilege and power are the law, and those who have neither simply have no rights beyond what those who do have them find convenient to observe. No matter how draconian and psychotic the actual language of laws becomes in these places, black people will be treated even worse; and no matter how much impunity is granted to armed bigots to harm black people, their actions will be treated with even more tolerance if not open encouragement.
The difference between then and now is that there are less theatrics involved, at least in the clownish sense of dressing up in robes and burning crosses - although right-wing talk show hosts seem to have compensated by ratcheting up the Munich biergarten oratory. Back in the day, murdering an unarmed black man suspected of something was a festive community occasion for the whole family to enjoy; but as with so many things in the 21st century, this activity has become more personalized - something for individuals to do on their own time, at their own convenience: Bowling Alone for racists.
Even with these changes, however, the effect is the same: Maintenance of a regional culture of lawlessness where power and privilege are the only possible defenses against being a victim, and towering obstacles to justice when possessed by a perpetrator. This is the system the Ku Klux Klan evolved to both reflect and uphold - a neo-feudal society existing in parallel to legal authorities that was held above all explicit laws and beneath all moral scruples. They were a manifestation of a collective "Stand Your Ground" mentality that granted plenipotentiary powers of life and death over subordinate classes to private cabals of white landowners who neither had to seek permission from legal authorities to act, nor had to fear any kind of retribution from them no matter how arrogantly they behaved. If they so much as "felt threatened" in any way, shape, or form - if their identity as a supreme race, class, and even regional culture was jeopardized - they had absolute impunity to commit murder and terrorism with the unconditional implicit support (and often overt endorsement) of authorities.
That's pretty much what happened with Trayvon Martin. A young man was walking through the "wrong" community - i.e., one "above" his station in the racial hierarchy - and under the Klan Your Ground mentality, that granted anyone in that community authority to kill him in defense of their identity. This isn't to say there isn't real (if paranoid) fear of crime involved, but enforcing racial power and privilege is the basic reason it has political support: A rich white guy shooting another rich white guy for "looking shifty" probably would have been charged with manslaughter, or at least sent to a psychiatric facility, and a shooting with a white victim and black killer would have had the system coming down on the shooter's head like a ton of bricks. So basically, in Florida, it's okay to be so afraid or hateful of black people that you shoot them for walking in a neighborhood with different demographics.
And that's the psychotically hypocritical, Orwellian aspect of Klan Your Ground laws that have made them so controversial, but frankly they would be insane and inhuman even if they were enforced with rigorous fairness across all racial and class boundaries. There is no justification for allowing people to place the "sanctity" of their all-important property over the lives of other human beings, let alone to validate irrational fear as an excuse for murder.
You are allowed to shoot someone robbing you at gunpoint because they're threatening your life, not because they're taking your money. So guess what, Wyatt Derp? You don't get to shoot people for mere property crimes and still call yourself a human being and an American. You're a murderer guilty of manslaughter. And that would be if a crime is even being committed by the guy you shot. If their only "crime" is being a different race than predominates in the neighborhood and/or wearing clothing you find plebeian, you don't even have legitimate cause to call the police on them, let alone violently accost them - and if you go so far as to shoot them, you're a fucking psycho. And any state which legally condones such behavior is lawless, immoral, and diseased.