Trayvon was getting in fights constantly and bragging about it to one of his girlfriends, who texted back that he was going to end up getting shot in the chest if he didn't stop fighting people and acting like a thug. Very prophetic on her part.
Trayvon was caught with stolen jewelry and a watch in his backpack by the school resource officer after his bag was searched following being seen vandalizing a locker on security camera. The items matched well with a burglary report filed from a house near the school that same day.
Zimmerman saw him and didn't recognize him, which makes sense because he didn't live there. He was temporarily staying with his father at his father's mistress's apartment. He had been sent up there to Sanford from Miami Gardens by his frustrated mother who was at her wit's end and sick of his fighting and thuggery and troubles at school. So Zimmerman was right about him being a criminal, a thug, a threat, and a stranger to the area.
Zimmerman's claim is that he merely kept an eye on Trayvon from a distance and never attempted to close the gap, but Trayvon ran off and then snuck/doubled back and ambushed him after confronting him and making threats. This fits other things we know about Trayvon, and it fits the timeline and where the altercation and shooting ended up happening. It looks like Zimmerman walked east at the "T" junction to see if he could spot Trayvon exiting from that vantage point, through the community's back entrance, and/or to see if he could get an address on that side. Then, when he walked back, Trayvon intercepted him.
Meanwhile, Ahmaud Arbery was a habitual criminal who was known to pretend to be a jogger to cover for his burglaries and thefts. The McMichaels and others in their neighborhood appraised him in an exactly right and accurate way, attempted to confront and detain him for the cops, and were physically attacked by a man who was not afraid of them, but angry at them for trying to impede his criminality.
Trayvon was never afraid. He was angry and violent and a criminal.
Ahmaud was never afraid. He was angry and violent and a criminal.
The case of Botham Jean who was shot in his own apartment is legitimately tragic and messed up. Big contrast to these other two cases.
Re: Trayvon and Ahmaud - responsible citizens who want their communities to be free of crime have a right to keep an eye on or even confront criminal interlopers. They even have a legal right to think someone is such, be wrong about it, and end up feeling silly. In these two cases, the neighbors not only weren't wrong about Ahmaud and Trayvon, if anything they underestimated their criminality and violence.
No society worth a crap would even give a moment's consideration to prosecuting the shooters in either case.