No a dead teenager is not evidence...
The biggest problem with this case is motive, and proving motive.
Now how can one prove Zimmerman didn't fear for his life??
Zimmerman had no provable motive to attack the kid - they didn't even know one another.
You cant convict an individual on the grounds of speculation.
Nick, you might want to learn a little bit about our judicial system. Proof of motive is
never necessary for an arrest.
"they didn't even know one another"
So if a cop walks into the subway and sees a man with a smoking gun standing over a dead guy, the dead guy "is not evidence..." of a crime because the cop can't prove motive or because they didn't know each other? Wrong.
Motive is often discovered after an arrest. it can be personal, prejudicial or psychological. In this case, it is most likely to be one of both of the latter two.
"You cant convict an individual on the grounds of speculation."
Correct. But no one was convicted. They were arrested. Thousands of arrest are made every year, based on speculation e.g. four radical Muslims were found in NYC with AK-47s, Stinger missiles and over two hundred pounds of amonium nitrate and fuel oil in a garage.
had they committed a crime? Nope. It was "speculated" that they were plotting a terrorist act and guess what? It was later proven.
The arrest is completely reasonable and actually, it would be an atrocity if one had not been made.