Seriously, I think the state had a pretty good manslaughter case against Zimmerman
While I think Zimmerman should have stopped following Martin once the police were contacted, following someone on a public street is not actually illegal in any way in Florida. Legally Zimmerman didn't do anything wrong there. Then he was promptly jumped and attacked by Martin. Had Martin used his fists alone I would absolutely want to see Zimmerman punished, but Martin didn't stop there. Martin was slamming Zimmerman's head into the pavement, something that can cause death or permanent disabling injury. He was, in effect, using the concrete as a deadly bludgeoning weapon. Zimmerman wouldn't have had a chance to try to flee considering he was on the ground getting pounded. That lead to Martin being shot. Correct me if I have any of that wrong (not liking it doesn't make it false...).
I think it's a damned shame that Martin got himself killed at such a young age. If it were up to me there would have been no conflict, or the mere sight of a gun would have scared him off and it would have ended there, but let's be clear about this: if you want to violently attack a stranger who has not initiated violence against you, you are taking a risk. It's a poor choice to make and all the sadness in the world about what happened doesn't suddenly make this a wise move.
Punishing Zimmerman doesn't change this reality, but it might make others who get attacked choose victimhood because they are afraid of the legal consequences of defending themselves. We already have states where homeowners hesitate to shoot a home invader because they might get in serious trouble, and all this does is lower the risk of burglarizing the law-abiding which in turn can only make burglers more bold. If being a violent criminal is a great way to remove oneself from the gene pool, I am absolutely fine with that. I have no sympathy for those who initiate violence. They live by the sword and sometimes they die by the sword. That's their choice. They are not victims. I reserve my sympathy for victims.
The worst part? Sounds like the evidence wasn't really relevant.
What is the value of refusing to let the jury hear this evidence? If it is truly irrelevant then it shouldn't influence their decision anyway. What damage could be done that the judge was trying to prevent by disallowing it?
Incidentally it certainly can't be worse than the photos shown of Martin when he was twelve years old, an obvious attempt to make him look as helpless and childish as possible to further demonize Zimmerman rather than showing him as he actually was, big enough and strong enough to do some damage to another man and old enough to know better. When people have to resort to these kinds of emotional appeals and outright distortion and propaganda tactics to make their case, I have to assume it is because the facts are against them.