Arbery was known to be violent. A gun had been stolen and they suspected Arbery as he'd been hanging around the neighborhood. Their neighborhood was constantly being burglarized. McMichaels, having been a cop, knew Arberys criminal record. Taking a gun was not stupid as they had no idea if Arbery had the stolen gun.
Try watching Officer Tatum, a black conservative, who was a cop.
I WAS WRONG ABOUT AHMAUD ARBERY - Officer Tatum