In my opinion you are incorrect. Again, Zimmerman killed someone. He KILLED someone. He admits to doing so, but is saying that he should be given a pass for this particular killing.
Do you actually believe he has no further obligations other than to say the two words, "Self Defense"? That's what you are claiming. And no, don't respond by saying that Zimmerman did say more than just this, because that negates the original claim that this was unnecessary. According to the oft repeated 'Florida law' statement, Zimmerman never needed to say any more than these two magical words. According to some, a simple "Self Defense" statement somehow kicks all the burden onto the prosecution. Forget the corpse, he said it was self defense.
Apparently some believe that the prosecution must prove exactly what happened, and why, and what people were feeling, and they must somehow demonstrate that it was impossible for the killer to suffer some unspecified injury down the road -- perhaps a lightning strike due to the storm. Can you PROVE lightning was impossible? It was Florida after all. And apparently Zimmerman doesn't even have to claim he was afraid of lightning, the prosecution must still prove that this fear as well was unreasonable.
<mod snip>. It's not THEIR job to explain why Trayvon Martin is dead, it's the job of the guy who followed and killed him.