There has been a lot written about this case. ISTM Bamber's latest angle, from the GUARDIAN is:
In finding him guilty of the massacre, he believes the court besmirched his family’s name.
The crime writer journalists make money by feeding the public's fascination. They put forward 'alternative theories'; in this case, the alternative theory is 'schizophrenic Sheila did it' and Hattenstone tries to make a big issue out of possible police misconduct and the press getting Bamber's smile at the funeral all wrong. They spend ages looking for errors or 'things overlooked' in court testimony.
They don't really grasp that typographical errors are only relevant if they have an impact on how the jury would have decided the case. In any criminal case you will find some error or other if one digs hard enough. But the criterion for a jury to find 'guilty' is simply Beyond a Reasonable Doubt. That DOESN'T mean 'no doubt whatsoever' as so many think it does, which is why it has now been simplified to the standard of 'being sure'.
In any criminal case it can be argued 'there could be an alternative explanation/perpetrator' or 'What if, the police and the courts got it wrong?'
For some people, it only takes 'an investigative journalist' like Hattenstone to plant the seed of doubt, which then turns into, 'Wow, it's not beyond reasonable doubt at all as this journalist in the New York Post has written 17,000 words casting doubt on the verdict'. Or 'Simon Hattenstone thinks the police might have been overzealous' not realising Hattenstone has carefully crafted his entire article to provide all kinds of doubts in the mind of the reader with the key claim inserted in that Bamber was only convicted because of a belief he hated his adoptive parents as they were harsh sticklers for Christian standards. So if Bamber can prove - Hattenstone's logic leads us to this conclusion - that far from it, 'Bamber never had no grudge against his parents, who were wonderful and kind, and he'd never hurt a hair on their heads'. What's more it besmirches the murder victims by painting them as someone who were asking to be murdered because of their 'orrible 'arshness'.
And besides, we all know that schizophrenics are dangerous crazed mass killers...
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