The UK justice system isn't behind closed doors, its all in the public domain. All court records are publicly accessible and reported on unless there are specific reasons not to do so, to safeguard children for example.
It just doesn't make it a public spectacle so hundreds of true crime nuts and armchair detectives/psychologists can make money from it.
It's that crap that has infected the UK psyche so that even the most obvious and clear cut circumstances get over-run with conspiracy theorists and people looking to make a quick buck.
Which leads to members of the public thinking they are experts in body language, psychology and how people will behave when traumatised with zero evidence to back that up.
I've lost count of the number of cases where someone has gone missing/found dead and social media posters create narratives that just don't exist.
Nicola Bulley and Jay Slater are recent examples. Really obvious explanations for both cases and SM lost their minds over creating conspiracy theories and confidently stating that family members/friends were definitely suspicious because e.g Nicolas husband wore a hat during an interview or Jays Mum 'just wouldn't do that if her son was really missing'.
Nobody knows how they would react if something awful happened to them. And nobody can predict how other people will react either.
I watched the Elizabeth Smart documentary on Netflix. While a lot of the public were confidently stating it was obvious her Dad or her Uncle had abused and murdered her based on how 'weird' they were acting and 'inconsistencies' in the families narrative, she spent 9 months being raped daily by a Religious fanatic.