Martin was a problem kid from Florida and he was suspended from high school because he was implicated in jewellery theft and he obviously looked suspicious wearing a hoodie when he was walking through a gated community where he was staying as a guest. And Zimmerman also has a history of violence and both Martin and Zimmerman are equally responsible for what happened. Zimmerman had no authority to pursue a suspect and arrest him and he was only supposed to report suspicious activities in his neighbourhood to the police. Martin may have jumped on Zimmerman first and the fight ensured made him pull the trigger in the end but prosecutors are unable to establish the exact circumstances surrounding the incident so far.
Zimmerman had all the authority in the world to pursue Martin, and no one had the authority to tell him not to. Rest of your post is good.