Lawyers are required as officers of the court to inform the authorities if their client is about to commit a crime. The Ramseys were about to, and in the process of, commiting several crimes relating to the coverup, such as falsely reporting a federal crime and interfering with an investigation, etc. If Bynum, knowing this, didn't report it to law enforcement, he would have lost the ability to practice any type of law, should he have been caught. I doubt Bynum would have taken that chance for John Ramsey or anyone else. If John Ramsey even attempted to tell Bynum what was really going on, Bynum would have cut him off and said "STOP - By law, I can't be privy to that information."