It makes perfect sense.
If someone as obviously guilty as Casey Anthony can be acquitted because, as various observers claimed, "the evidence just wasn't there to prove guilt beyond a reasonable doubt" then it follows in the case of George Zimmerman - where there is zero evidence of guilt - the reasonable doubt standard would make it that much easier to acquit.
Anthony shows us that Florida juries apparently need live HD footage of a crime in order to convict someone.
Okay..............