That was a rhetorical question, yes?
Sort of. He had free representation and the police were already reporting, on the basis of his statements that Mr. Scott was struggling with him for the taser, indeed, that he attempted to USE the taser on the officer.
The second part is my cynicism showing. Basically, from the video and reports of officer testimony, there should have been enough evidence to fire him and probably to charge him with murder even without the video, but sadly I think the video was necessary to actually get this result.
Evidence such as - location of shell casings, shot from behind, 5 times, rather than in front. Lack of flash burns indicating point blank range of shooting(within range of struggle). Etc...