[Q
noooooo, arberry was robbing and then he started punching
Robbing?
Georgia Code § 16-8-40
(a) A person commits the offense of robbery when, with intent to commit theft, he takes property of another from the person or the immediate presence of another:
(1) By use of force;
(2) By intimidation, by the use of threat or coercion, or by placing such person in fear of immediate serious bodily injury to himself or to another; or
(3) By sudden snatching.
So from whom did he rob?
If he stole anything (or it could be shown he intended to steal) from the property, it would have been Burglary. Anyone remotely related to law enforcement should know the difference.
As for trespass: § 16-7-21
(a) A person commits the offense of criminal trespass when he or she intentionally damages any property of another without consent of that other person and the damage thereto is $500.00 or less or knowingly and maliciously interferes with the possession or use of the property of another person without consent of that person.
(b) A person commits the offense of criminal trespass when he or she knowingly and without authority:
(1) Enters upon the land or premises of another person or into any part of any vehicle, railroad car, aircraft, or watercraft of another person for an unlawful purpose;
(2) Enters upon the land or premises of another person or into any part of any vehicle, railroad car, aircraft, or watercraft of another person after receiving, prior to such entry, notice from the owner, rightful occupant, or, upon proper identification, an authorized representative of the owner or rightful occupant that such entry is forbidden; or
(3) Remains upon the land or premises of another person or within the vehicle, railroad car, aircraft, or watercraft of another person after receiving notice from the owner, rightful occupant, or, upon proper identification, an authorized representative of the owner or rightful occupant to depart
Clearly none of those apply.
Now let's look at the McMichaels
§ 17-4-60
A private person may arrest an offender if the offense is committed in his presence or within his immediate knowledge. If the offense is a felony and the offender is escaping or attempting to escape, a private person may arrest him upon reasonable and probable grounds of suspicion.
So they were not conducting a lawful citizen's arrest because they witnessed no crime.
§ 16-5-20
(a) A person commits the offense of simple assault when he or she either:
(1) Attempts to commit a violent injury to the person of another; or
(2) Commits an act which places another in reasonable apprehension of immediately receiving a violent injury.
Your claim is that Arbery violated (1), but the McMichaels violated (2) first, making them the aggressors. But wait, there's more
§ 16-5-21c(a) A person commits the offense of aggravated assault when he or she assaults:
(1) With intent to murder, to rape, or to rob;
(2) With a deadly weapon or with any object, device, or instrument which, when used offensively against a person, is likely to or actually does result in serious bodily injury;
(3) With any object, device, or instrument which, when used offensively against a person, is likely to or actually does result in strangulation; or
(4) A person or persons without legal justification by discharging a firearm from within a motor vehicle toward a person or persons.
So by blocking Arbery, unlawfully trying to detain him while holding deadly weapons, putting him in reasonable fear of immediate injury or death, the McMichaels committed aggravated assault.