This event happened in the 80's at which point abuse really wasn't a thing that was talked about, so comparing it with todays environment just doesn't work. Many juries wouldn't believe it was an actual credible possibility
The way the show was dramatised, really didn't work for me. It's like latter series of the crown, where we are all well aware that apart from the key historical facts, the rest was just fiction. Look at the jury discussion during sentencing. That was just complete nonsense. They were going back and questioning whether they were innocent or guilty, where the same jury had just unanimously declared them guilty. The object of sentencing is to determine the death or imprisonment, not to relitigate the case