CHICAGO — The police officer who shot Jacob Blake won’t face criminal charges for firing seven bullets into the former Illinois man during a struggle in August, prosecutors in Kenosha County, Wisconsin, announced Tuesday. Relying upon arguments that have long protected officers in on-duty shootings, Kenosha County District Attorney Michael Graveley said he would not be able to disprove Officer Rusten Sheskey’s self-defense claims. As in most states, Wisconsin law holds that officers can shoot if they reasonably believe firing is necessary to protect themselves or anyone else from serious injur…