Doing "something wrong" does not necessarily mean that one has committed a criminal act, even if in the extreme case, "something wrong" might result in another's death or some lesser harm. (Medical malpractice would be a good example where this principle pertains, but there are many others in all walks of life.)
In the Zimmerman case, self-defense is an affirmative defense against any of the charges you mentioned. The crucial factor is Zimmerman's predicament at the time the fatal shot was fired; nothing before or after really matters, except as it may relate to his state of mind at that single instant.
And from some the stuff alleged about his past he may be as much a punk as Trayvon was.
Puh-leeze, prosecutors just about always bad-mouth the defendant's character, no matter what the charge. It's par for the course. The defense, on the other hand, has to rebut this by bringing in evidence to show that the defendant is nothing like the ogre he is alleged to be. In this case, the defense did a pretty good job of that.
Prosecutors need to start caring about JUSTICE, not making their political bones.
Prosecutors "making their political bones" have been an integral part of the criminal justice system from the get-go. It would not be difficult to go back into American history and find names of people who rose to high positions in politics after gaining prominence as prosecutors: governors, mayors, legislators, judges, etc.
Told you someone would flame me. ;)