OJ is going to serve at least 4 more years because he was sentenced consectively not concurrently even if he gets paroled on this charge. Sorry but he deserved the chair as he killed those two in cold blood in the heat of passion.
Sorry but GZ deserved the chair as he killed the minor in cold blood. He could have wounded him if he was so good with a gun to carry one all the time. He didn't have to follow and confront him, he could have identified himself like a real cop would do, he could have even waited five minutes for the police to arrive, if he was so weak from fat to fight back. Which of course he wasn't, he was using a punching bag and training. No, OJ and GZ not guilty under law, but both deserved the chair. GZ put that gun to Trayvon's heart and pulled the trigger, and was in the police station strolling about, looking, talking fine, afterwards. The ear witness said Trayvon said get off, get off. GZ was the initial aggressor, cartoon video or not. Sorry no excuses for that.
If you accept GZ's innocence under law, the same applies for OJ. OJ is innocent too.
According to our system of justice, you're correct on both counts. Until you find a better way and get everyone else to go along with your changes, you will have to learn to deal with a decision you don't like. Sorry!