I want to know the answer to the following question:
Who wrote the actual story?
All the background I'm provided with is that "Despite the headline, written by Kelvin MacKenzie, the story was based on allegations either by unnamed and unattributable sources, or hearsay accounts of what named individuals had said – a fact made clear to MacKenzie by Harry Arnold, the reporter who wrote the story.". Is that enough to answer the question?
Answer: yes