Viewpoint as in 'through his eyes'. We can revisit this once the documentary has aired and we'll see who is right. Why would they be interested in 'debate'? They are simply telling a story of what happened, why would they care about the OS? They are bothered about ratings not forums and websites.
Debate equals viewers. People will talk about it, tempting other people to watch. 'Who shot JR' was a debate which got record viewers.
It's a 6 part drama so they will use artistic licence to make it more sensational & entertaining for the viewer. The best way to do that is to create doubt.
The makers don't care whether viewers go onto the OS. However with millions watching, even if the drama leaves a 1% doubt about Bambers guilt, thousands of viewers may investigate more. If it leaves a 20% doubt....