I did say why, and you already addressed it
The reason my belief has held firm is because there was never a law broken to begin with up until the fatal confrontation occured. The confrontation Zimmerman brought on himself, and Zimmermans actions/negligence in part helped bring about the death of Martin. G Zimmermans a neghborhood watch person, something practically anyone can become, not a cop and we can't have neghborhood watch killing our kids because they look suspicious, it sets a bad example. Trayvon Martin's not here in the flesh to tell his side of the story, one which may cast doubt over a G Zimmermans account of what really happened that cold dark night the young teen met his tragic ending.
I'll add that Zimmerman was negligent because he was told not to get out of his car yet did anyway and took the law into his own hands by doing so, negligent because the actions Travyvon martin was observed doing did not merit such an extreme response.