Friends do NOT cover up for these types of things unless IMO they are evil social paths.
Now there are 4 adults involved in writing the note and staging JBR body after the "accident" ? lol
Normal people just dont do this. Among this group, i do believe they all had chilldren....they probably had grown fond of jbr and hard to believe they would stage everything and lie. JMO
Normal people sometimes find themselves in abnormal situations. They don't have to be sociopaths. They just have to be VERY frightened. Afraid of the Rs pointing a finger at them (especially if they were there that night- DNA and fibers, etc.) and especially of having to spend a fortune on defense attorneys if LW came after them.
I had a young cousin murdered years ago. It was someone looking for her new roommate, who apparently had a darker past than my cousin was aware of. It was like a movie- the kind of thing you never think will happen to your family- it happens to other people. No "crime scene clean-up" van shows up. Three bullets in the head at point blank range is MESSY. Picture yourself as a young mom (as I was then) with paper towels, windex cleaning up brains and blood, with the landlord banging on the door to "get that place cleaned up, I have it rented already". NEVER underestimate what "normal" people will or will not do in a situation that is anything but normal. We (her cousins) did what we had to do, to try to spare her parents doing it. BTW, her roommate survived, having been shot in the mouth. She lost her tongue, but otherwise recovered. She was allowed to return home to Canada to receive medical care. When the perp was caught, (she had identified who it was) she refused to come back to New Jersey to testify. Police couldn't force her.
The perp walked free.
Three weeks later, he was killed.....
Gotta love New Jersey.