Hadn't JB allegedly told RWB that he could " kill his parents ?" Why didn't he do something about that at the time ?
Like "Good Morning officer, I'd like to report that my nephew has just told me he could kill his parents"? You know perfectly well the answer would very likely, if it hadn't been "And?", would most likely have been "Thank-you, Sir, but there's nothing we can do until such time as a crime is committed". It would then have been forgotten about..................
.................However, I'm aware that the irony is that had he got together with Julie and shared information.............? Two heads are always better than one.