Have you ever been to the inner city? Have you worked there for twenty years? How many fights have you been in? How many fights do you know of where someone was beaten to death? Sometimes we base it on personal experience and common sense.
Yes, no, none of this sort, none firsthand (since you like direct answers so much, and despite the fact that your response is just a bunch of rebuttal questions as well). But your personal experience and common sense does not magically make it so, that people don't die from fights all the time. It may not happen every day, but it certainly happens. And the deaths may not be the result of fists alone, but once they're in a fight they don't stop to decide the ground rules. Neither party knows what weapons the other has. We know Zimmerman had a gun, what if Martin had wrestled it from him and shot him?
You're trying to get a sense of where commenters stand on this case? I'll lay my opinion out for you. Nobody is in the 'right' here, not Zimmerman and not Martin. The end result is that Martin was killed, and so automatically, the weight of potential wrong-doing shifts to Zimmerman. He did things he shouldn't have done that led to him shooting another person, and so on the scale of right and wrong in my head he was wrong. But that doesn't mean that he deserves to be wrongly convicted. Based on my (very limited) understanding of the law and the case, he was not guilty of any crimes.
On the other end of it, the family and friends of Martin deserve to be able to mourn their loss, irrespective of any possible 'wrong' he may have done that contributed to his demise. But that doesn't automatically mean that there has to be a guilty party on the other end.