No, Zimmerman was acquitted because he REASONABLY believed that he was in mortal danger. The jury heard and saw all the evidence. They were convinced Zimmerman's belief was REASONABLE and they unanimously acquitted him of all charges. Medical professionals testified that Zimmerman was in mortal danger because his head was being banged into the concrete pavement. Zimmerman did not use the stand your ground law in his defense, it was a simple self defense case. Your ignorance on this, and other issues, brands you as thoughtless.
The color of Zimm's head is irrelevant except to racists. White men are allowed to defend themselves, as are black men, as are those in the conveniently created category of "white-hispanics". Even weepy lefties such as yourself are allowed to defend themselves.
The pop-corn killer is a completely different case. It has not come to trial yet. From what I know of it (not much) it does not seem that self-defense is reasonable. If it goes to trial, I expect a guilty verdict. More likely, the killer will plead guilty to a lesser charge.
Stand Your Ground Laws are not stupid, they are quite reasonable. An added benefit to SYG laws is that they annoy those who want our streets to be ruled by violent criminals instead of peaceful citizens.