For real man, go watch the trial. Your lack of understanding is embarrassing. No one who has ACTUALLY watched the trial shares your opinion.
He went to Kenosha (where he worked, his dad lives, and his grandmother lives) unarmed, during the day, to clean up graffiti and destruction the rioters left behind the night before. While cleaning up they spoke to the owner of 3 car lots, who had one of his lots torched the night before. The owner asked if they’d help protect his other lots as night fell. They borrowed guns (which he was legally allowed to possess and open carry) and stood watch. Rosenbaum saw them, and threatened to kill them if he caught one of them alone. Kyle got separated from the others when he went to extinguish a gas station dumpster that Rosenbaum and friends hat set ablaze and were pushing towards the gas pumps. Rosenbaum got pissed that Kyle extinguished his arson, and chased Kyle down. As Kyle ran away, he was heard yelling “medic! Medic! Friendly friendly friendly!” When he hit a dead end he turned to face rosenbaum who was still charging and reaching for his gun, and he fired 3 quick shots. He approached him to render first aid, but the gathering crowd started yelling “get him kill him” so he took off running again. He ran directly towards the police. When he fell, he was kicked in the head and attacked by Huber with skate board, and Huber grabbed the barrel of Kyle’s gun and pulled it into his own chest when it fired (possibly in self defense, possibly as a consequence of pulling against kyle’s trigger finger). Then Grosskreutz (who testified on the stand that he saw Kyle earlier that night rendering first aired to a rioter) approached him and pointed a loaded handgun at his head, so he shot him. He then ran directly to the police. He spent 2 months in jail before he could raise bail, (for a something he was acquitted of)
Watch the trial. Read the transcripts. Watch the footage. It’s all there plain as day.