Trying to catch a suspected thief in your neighborhood, to question (even if you're armed) is not against the law. It's common sense. It's helping your neighbors. It's morally and legally legal. It's what good neighbors do. And for good reason.
When that suspect won't stop, won't talk, and the cops are not even close to being there, it's the right and legal thing to do. Being armed is also legal. What's not legal is attacking someone. What's stupid is attacking someone who's armed. Which is what Arbery did. He attacked an armed man.
The right things for Arbery to do, is just stop and have a conversation as to why you were trespassing on private property. Snooping around in someone else's house. Let someone know you were was just looking around.
Was diagnosed with a mental disorder and had been smoking pot. According to medical information, pot makes people with his mental condition, can make them aggressive. Seeing the webcam footage from the prior incident, that seems to be true.
Both parties were aggressive. But the McMichael's aggressiveness is warranted, due to the fact that Arbery had just trespassed and was caught doing it. So if his intentions (trespassing) were not to steal anything, then there was no reason to run and make things more suspicious.
Just as the webcam shows, just have a conversation. Not get all riled up and aggressive.
With all the chasing, the defense in wrong about "false imprisonment" and detaining Arbery. They never stopped Arbery. They never confined him. They may have attempted to. But they were unsuccessful in their attempt.