"And yet the dead bloke's sister is defending him..."
What you've forgotten, Tora, is that the gentlemen concerned was a member of a certain "community" where such behaviour is commonplace. She no doubt takes the view that her boyfriend was killed in a workplace accident.
What is also overlooked is that Mr Osborn-Brooks and his wife had their lives devastated by this incident. They lived in a comfortable house and, at 79, had probably planned to spend the rest of their days there. Instead, because of the activities of Mr Vincent's friends and relatives (they set up a "shrine" to their loved one just a few yards from the Osborn-Brooks's house) and the threats they made to the victim of the burglary, they were forced to move, effectively into hiding. Mr Osborn-Brooks had no say in these events and his life has been thrown into turmoil. Mr Vincent certainly did have a choice but one that thankfully he will not be called upon to make again.