No, that is what brought it to national attention but since then, the issue is the right to defend yourself, especially with a gun. That is the only reason that the left hasn't moved on from this case.
I respect you, but I disagree with you a bit, Pred.
This issue became a media sensation because of the way the media distorted the facts while stirring up notions of racism. They even called Zimmerman a White-Hispanic. That has always been at the core, and even though the Martin family's attorney stated the issue wasn't about race, I'm sure it still is in the hearts of some of those who continue to hate George Zimmerman. Because of their hate for GZ, with their view of him as a racist murderer, they will grasp at any string they can to punish him. They'll accuse him of being a wuss, a wannabe cop, a bad student, a racist, and a liar. They gun issue is one means to punish him for supposedly being a racist.
They will not move from this issue, and if GZ is acquitted, there will likely be violence from some as well as great anger.