What you’ve posted proves nothing more than after the fact details. There is nothing there which provides any facts that either Zimmerman or Martin started the incident. There has been no witness statements which have provided evidence of any kind prior to the reported fighting and the shot being heard. Zimmerman could easily have confronted Martin, and Martin could have engaged in “self-defense”. The fact that the guy with the gun won means nothing as to who the original aggressor is.
Based on the physical evidence and statements, the police concluded initially that it was a case of self-defense. Zimmerman claims he was the one who was attacked. He was returning home from an errand when he noticed this guy acting strangely. He reported it to the police and waited for them to arrive.
We do know that Zimmerman had a bloody nose and and blood on the back of the head and that his back was covered in grass stains. We don't know what injuries other than one bullet wound were suffered by Martin. The fact that there was a physical scuffle indicates to me at least that Zimmerman did not shoot Martin immediately, but only after he was engaged in a fight with him. And Martin's father has confirmed that it was not his son who was calling for help during the struggle, it was Zimmerman.
You seem to doubt Zimmerman's story. Why? Shouldn't he be presumed innocent until proven guilty? We now have Al Sharpton and his minnions making this into a cause celebre for political reasons. It is being used by the Dems and Obama to rally and energize their base in the runup to the election. It has been done before.
Zimmerman is now getting a thorough vetting by the press, but very little is being said about Martin and whether he has had some prior run ins with the law or school authorities. Zimmerman has already been convicted by the MSM and the Left similar to what happened to William Jewel.