That was murder, not self defense. The shooter had plenty of room to retreat and his life was not threatened, murder.
It was a hate crime, a Negro who wanted to shoot a white person.
What was him to retreat from? A female 14 year USAF Veteran was just breaking a window. There is video showing armed LEO behind her on her side of the door and they did nothing as she broke the window. I personally believe it was a Congress critter's bodyguard wannabe cop. He was in a suit with no visual armor nor a helmet.
Either way, he committed murder or at least unjustified homicide. I don't think the system is going to protect him. Interestingly, the other side of the Capitol had Capitol Police escorting the protestors inside along a red rope. There are photos of that, also.
Obviously, Antifa ginned up the hysteria and some Patriots got caught up in the mob mentality, as happens. However, I've read no reports of defacing, destroying, stealing of historical paintings and artifacts. I have also read first hand reports that the Patriots asked them to maintain civility.
Then the Capitol Police figured enough and tear gassed them to leave. Saw many first hand reports of that also from Patriots who had been inside and left when the gas started. No shots on any of those folks.
In the closing instant right before shooting, the shooter ADVANCES TOWARDS Ashli Babbitt in order to get a better shot, closing the gap between the muzzle and Ashli’s neck from about 7 feet to 5 feet.