Zimmerman's guilt or innocence is a question of law, not philosophy.
If you want to discuss whether the law is fair, or moral, that might be a philosophical question.
zimmerman could have been convicted of manslaughter, some think that is just or unjust. what a jury or judge deems of weight or what they dismiss or excuse as well as what they don't in determination is up to their judgement, moral faculties and thinking just as the differing opinions on this thread.
if it was just a case of law, it's easy and this thread not need last more than a page. we already know what the syg law is, that doesn't mean the verdict was correct or that gz couldn't have been held accountable on other counts. that's what this "particular" jury decided.