When you read the actual police report from the responding officers, you note that they say Zimmerman had a bloody nose, and that he received attention from the paramedics on the scene after Trayvon Martin was pronounced dead. Why not ask the paramedic if Zimmerman had a bloody nose? I would guess that is what the State's Attorney investigating this case is doing. If you are in the media, why put out statements that can be easily proved as false and inflammatory?
Then there are the cries for help. Forensic experts have analyzed the calls for help heard on a witness' 911 call, and have concluded that there is only a 48% chance the voice on the tape is Zimmerman. They cannot prove the voice is Trayvon Martin's, because they do not have a sample of his voice for comparison. So Martin never left a voice mail on his girlfriend's phone? He didn't record a voice mail greeting on his own phone? Really?
I have a particularly hard time accepting the racist executioner scenario in this case. This is the version of events that has Zimmerman confront Martin. Some kind of verbal and/or physical altercation occurs. Then, Zimmerman pulls his gun, and while Trayvon Martin pleads for help, shoots him in the chest. This just doesn't make any sense to me. Zimmerman knows the cops are going to arrive on the scene any moment, because he called the cops. Once he has the drop on Martin, why pull the trigger?
Then having shot a man in cold blood, the racist executioner scenario requires Zimmerman to make up a cover story in the two or three minutes before the cops show up. The scenario also requires almost complete collusion by the police. Now, if it was a white police officer who shot a black teenager, I could believe that the police would close ranks. But the responding officers didn't know Zimmerman from Adam.
One of the interesting aspects of this case is the lack of faith in the police from both sides. Treyvon Martin was on the phone with his girlfriend when he told her he was being followed by a suspicious looking man. She tells him to run. Why didn't she tell him to call 911? Why didn't Treyvon Martin think of that? Apparently it never occurred to him to call the police in a threatening situation.
Zimmerman has a different lack of faith in the police. When requested by the 911 operator not to follow Martin, his comment was "These assholes, they always get away." The motivation of the 911 operator is easy enough: her training is that if the caller pursues the person they are calling about, the odds of a physical confrontation escalate enormously. This is exactly what did happen. Zimmerman's motivation for disregarding this advice (as far as I know, 911 operators do not have the authority to "order" anyone to do squat) was his belief that the person he suspected would disappear by the time the police showed up. The police would then drive around, come back, and tell him that they hadn't found anyone. The neighborhood where Zimmerman lived was subject to a number of break ins during the last year. This has not been a widely covered story, but I'll bet that none of them have been solved. No arrests made.
We may never know all of the details about what happened that night. But I have a hard time seeing a criminal case against George Zimmerman for killing Trayvon Martin making it past a jury of Zimmerman's peers. Now, a Justice Department case against Zimmerman for violating Martin's civil rights? I think a conviction will be pushed through on that side.
Of course, at that point it is not a criminal matter any more. That is more of a political trial.