I can understand (not agree with) Pizza Hut's policy on personal weapons. In out litigious society one can easily see going to the "deep pockets" of Yum Brands. However in this case we have a former LEO (if prison guards qualify) who exercised great restraint before exercising equally great gun control - "They're dead, Jim".
My prayers for he and his family as they go through a horrible time, but by every fact this was a totally justified shoot and may have saved the lives of him and his manager.