This has been my position for YEARS. In the NFL, points are at a premium, take the 1pt XPA and don't start chasing 2pt conversions unless it's LATE in the 4th and you NEED to do so.
Lead by 1 or lead by 2, it really dosnt matter a fg takes the lead. He went for the conversion to lead by a fg that way all KC could do with a fg was tie.