It was an opportunistic killing and in his mind worth the risk as the scapegoat was in situ. He was minded to petty criminality such as burglary but this even for him was a huge step up. Now he's incarcerated he's probably frightened of retaliation for being labelled a child killer.
He is a not a sex killer. He isn't a classic pedophile child killer
He is not an Ian Huntley Roy whiting type of individual
He is not as high profile in the prison system as you think
I can remember him telling me many years ago his toughest time in jail was after conviction. At HMP wormwood scrubs. After that his jail has been a constant innocence campaign. Many in long lartin though him innocent ( including staff)
Many people in their don't look at Daniel and Nicholas and think Bamber, they term Bamber as the guy who " offed his parents for the dough ( cash)
In fact Daniel and Nicholas seem to fade into the background in the whole scenario. It has always been Shelia or Jeremy the prominent characters. As do nevill and June. Once it got to court it only mattered about Jeremy and Shelia