1. He fitted the description of the suspect, was fleeing the scene of the prior burglaries and refused to stop and explain himself. 2. No, watch the vid, the shotgun is pointed at the ground. Arbery could have smashed against the truck in frustration that they were attempting to detain him for the police but we shall see. If they suspected Arbery of theft/burglary in the neighbourhood then it was reasonable to suspect him of stealing the pistol. 3. And I'm sure if the circumstances were reversed it would have been Arbery standing over Travis calling him a "F*cking cracker/honky" for forcing him to kill him over such a trivial incident. 4. If they didn't see them they didn't see them, that's not 'convenient', that's just the facts.