I have some empathy for this view but I believe there's more to it than just plain old pro-police CAL. And why would the defence want a drama produced anyway? Surely It would have to more of a docu that allows the police to counter? They may come out on top re the two things you mention but some other stuff is not do easily explained.
Nevills 999 call and Shiela's ambulance call should never be in a true crime drama or documentary because they are proven false and just harms the defences credibility.
The authorities would not want anymore attention brought to this case. This show is not actually showing who was behind the trigger anyway.
Come to think of it. The format of this show has Sheila dead from the beginning. All they can do now is assassinate JBs character with hyperbole and half truths to imply to the audience that it was him. If they didn't do this then they wouldn't have a show or it would be a very boring one with bad reviews.