No, he threatened Dunn, and Dunn is now imprisoned for life for defending himself. It says a lot about you that you think that’s acceptable.
Sure, Dunn should be in jail for attempted murder, for shooting as the others were fleeing, but not for murder, as there was no murder.
So, apart from the evidence, we have no evidence. Fine…
We don’t know. Fine, then Zimmerman is innocent. Come back when you can prove Zimmeman started the altercation.
But unless you have evidence otherwise, Zimmerman is the victim of a crime, not a criminal.