Since I have to pick between the 3 that you listed (I'm totally ignoring Zimmerman for obvious reasons), I have to pick O J Simpleton... because, after all, he killed two people, not one. And you should have listed Israel's freeing of those Fakestinian murderers, because then it would have been a no-brainer. I see red just thinking about this traitorous maneuver by Bibi.
Having said that, both Michael "What's wrong with molesting young boys" Jackson and Casey "I killed my daughter and now I can party" Anthony got away with their crimes and, in both case, it, too, was a horrible miscarriage of justice.