Your [sic] missing the obvious here... Arbery isnt on trial....
Actually, when a defendant claims the defense of self-defense, in a sense, the victim of his actions comes to be on trial, because now the prosecutor must prove that the victim was not posing an imminent, potentially deadly, threat to the shooter at the time of the incident, and the shooter is proffering evidence of the opposite, then the jury makes a decision on it based on the evidence.
