I'll ignore your little rant at the beginning of your post. It's just sill nonsense.
Thieving doesn't amount to murdering but greed can and often does.
What convictions? I believe that Julie's life of crime was mentioned. The defense knew all about her involvement in the caravan park robbery and the bank fraud. They would also have known about her selling drugs for Jeremy.
EP knew about JM's crime,but neither the court,nor the jury knew or else why was she given immunity before the trial ?? So that she could be used by EP ! I bet even the relatives weren't best pleased when they first found that out,although would it have mattered to them ? No.
What would you think if drug-dealers/drug smugglers/cheque-fraudsters and thieves were all given immunity ?
You believe in JB's guilt,you should also believe that JM acted as accessory !!
Judging by " Matters of the Estate ",it certainly wasn't Jeremy who was greedy !