There is really only a few different angles for these shows.
A common one is the contrarian
The police say the accused did the heinous crime but really he stands falsely accused. Let me reveal the truth!
This was common with Pistorius and Knox and even the parents themselves. Whatever you think about innocence in the cases, the way the docos work is to portray the accused as the victim of injustice, but then hint they might really be guilty.
In this case, CB is completely unsympathetic - so MWT seems to have set himself a much more difficult task.
I do wonder if he set out to make this doco and was left with not much he could use for a compelling story.
BIB
we have long wondered whether this 90 min single film that we saw today is it - has it been broadcast in other countries as a 3-part series?
eta: but tbh, this was NOT a compelling story... anybody with half a brain will have already lost it.