How about...the above sentence makes no sense?
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.