While I understand your point, and it is a valid one when considering the role of a juror, I think you are overlooking an important facet of the Zimmerman case. Consider the following from the link you provided:
Originally Posted by mak2
"In order for an indictment (the piece of paper actually accusing a defendant) to be handed down, either a grand jury (seven citizens selected from the jury pool) must "believe the person is guilty" or a judge after a preliminary hearing must make a finding that "probable cause" exists to charge the defendant — that is, a finding that the defendant is "probably" guilty.
Accused persons, therefore, go to trial with a finding having already been made, albeit in some cases haphazardly, that they are more than likely guilty of the crime alleged. A terrible stain is cast upon them. Even if the jury concludes that reasonable doubt exists as to guilt, it is a stain that will remain forever."
This is where people believe the state of Florida failed GZ. First of all, the Grand Jury step (which is the generally accepted method of bringing these charges against someone in cases such as these) was purposefully not utilized for political reasons. Secondly, there is reason to believe that the only reason GZ was indicted was because of purposeful deceit and the omission of exculpatory evidence in the information provided to the judge. In essence, the attorneys seeking an indictment misled the judge to garner an indictment. Thus, GZ was wrongfully indicted due to him being denied the protection of a grand jury and the professional misconduct of the attorneys in their filings to the judge. This was highlighted in the trial itself by the generally weak case brought against him by the prosecution. That is the reason many believe GZ does not deserve the "terrible stain" that has been cast upon him; he should never have been charged with murder in the first place. So, yes, while the jury couldn't technically find him "innocent," that original determination of innocence (by a grand jury or judge) was tainted and it is an injustice to not acknowledge that when considering how he now has to live with "a stain that will remain forever."