Yes but the film doesn’t offer any other insight into their home life outside of the parents behaviour at the police interviews. The transcript of those (bar the ones withheld) have been in the public domain for years. So the film offers no more insight into the killers backgrounds than what we already know.
They have, but transcripts don't aways convey everything - much like the Taylor report (as good as it was) could never hit home like the docu-drama 'Hillsborough'. I think the two go hand in hand sometimes - at least they do with a good drama.
For many of us, it's in recent memory, for others it's more than a lifetime ago (anybody under 25). So the perspective between two viewers can be very different.
When you read of the account of the boys legs not being able to touch the floor after sitting on a chair, or when you actually hear their interviews, it lends something that the transcripts alone can't.
Some of the officers involved at the time recall just how unprepared they were for how young they were. It's one thing to know the age, it's another to realise they barely reached hip height of some officers.
Their interviews were those of streetwise kids - quick answers and immediately blaming each other, at the same time no real sense of the gravity of what they'd done. You can barely imagine the conflict of emotions the officers and even the press must have had. A good drama will reflect that. A bad one won't.
Personally, I can only hope it helps people to grasp how desperately sad the whole damn thing is / was. How even society itself wasn't sure how to handle things. New precedents in law occurred as a result. Arguably, mistakes were made in how we dealt with them.
Plenty in society then and now, would have been willing to make it three deaths instead of one. I don't know what that says about us, but it's a good thing we keep questioning what it says.