Filmmaker Dan Reed has revealed the 'one big question' he wanted answering when he first started working on Leaving Neverland.

Dan's two-part special for HBO centred around the testimonies of Wade Robson and James Safechuck, who accused Jackson of grooming and abusing them when they were his child companions.

Reed - who previously admitted being 'sceptical' at the outset - not only wanted to find out why they'd waited two decades to come forward.

But in particular, he wanted to understand why Wade took the witness stand to defend Jackson in his 2005 child molestation trial.

(Image: Channel 4)

Speaking to Deadline, Reed said that he hoped his controversial documentary found the answer to this much challenged question.

Reed said: "For me, that was one of the big questions that the film had to answer… why Wade and James didn’t say anything for so many years and why Wade took the witness stand in 2005 in May and said, 'Michael never touched me'."

Reed says that it wasn't easy for Robson and Safechuck to share their allegations.

(Image: Eugene Adebari/REX/Shutterstock)

(Image: Channel 4)

Reed continued: "The answer is, 'It's complicated', because you have to understand the psychology of child sexual abuse."

It was further complicated, Reed says, because Jackson allegedly groomed the boys' parents too.

He continued: "[They] were all being hoodwinked by Jackson and had kind of aligned themselves with the narrative that whatever was happening behind those closed doors of the bedroom in Neverland was just innocent fun.

(Image: Amos Pictures)

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"The mothers believed that. The sister believed it, the brother believed it. The dads believed it. They were all taken in."

Since the documentary aired, Reed has been subjected to 'numerous death threats' from Jackson fans and the singer's estate has filed a lawsuit against him.

Despite this, Redd says he stands by "every second" of his film.

The filmmaker has also indicated that he has two further documentaries that he wants to make, that centres on allegations made by other accusers.

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