This whole case was such a nightmare of mis/disinformation, and although I'm sorry Trayvon's life was lost, there are quite a few other people's lives that were ruined by Trayvon's behavior (as I understand it - Trayvon could have run for home instead of circling back to administer "whuuuup-aaaaaaas").
Lack of judgement abounds here, but however blame is laid, it should not fall on the the Sanford police, and Zimmerman was acquitted under the law. Nevertheless, they will suffer as much as the Martin family and friends, although I doubt the Martins would see it that way.
The Martins are in full exploit mode, far beyond rationality or reason.