(V):" The case is that Zimmerman claims he shot in self defence. To which ... he gets a keep out of jail 'free' card."

Wrong: The evidence at the scene didn't give the police proper probable cause for an arrest. It wasn't Zimerman's claim alone that mattered. The evidence at the scene mattered. The police had some eye witness testimony that supported Zimmerman's story.

"Zimmerman phones up 911 claiming he's following a suspicious guy who is 'black', therefore using racial stereotyping. He then claims he shot the guy in self defence."

Again you are wrong: Zimmerman identified Martin's race only after he was asked by a dispatcher. One can only assume that racial profiling was a factor. That is unless you also studied mind reading in college.

"Yet other calls,as there is more than just one (but keeping all the talk to just 'one' is pettifogging) .. show that at the time of the shooting Trayvon Martin was indeed calling for help a few times and was indeed trying to get away from this strange dude following him."

There is no claim to only one call. And it's not yet determined whose voice is on the tape recording. He said/she said only.

"Self defence or trigger happy nut job?"

Well that's the question now isn't it? How marvelous you and others can make such positive determinations regarding the facts of this case even BEFORE all the facts are known. Simply amazing.