The reason the judge didn't allow the defense to pursue this line of questioning [regarding the purported diary entries] is because he had laid no foundation for it. The defense cannot use third party culpability as a defense or make accusations of specific persons without supporting evidence. The problem here is Judge Mudd. He's the one -- so far, at least -- who has had the sole discretion to decide what qualifies as admissible evidence.
Based on what I've read about this case, Mudd pretty consistantly decides for the prosecution and against the defense.
So even if the rumored contents of the diary are all completely true, Mudd could well have ruled to exclude it. That and other things as well.
If the jury convicts, in time we'll likely get to hear more about all that. While DW molters away in a cell somewhere.
Mudd should be removed from the bench. Not tomorrow or the next day.
The journal was admissable evidence, check the discovery motions. Neither side chose to use it. FWIW, the rumors about it excite our imaginations, but the Defense and the Prosecution are actually in possession of the documents and know the TRUTH about them. No one used the journal, because it is extraneous and provides nothing to either side of the case.
Let's remember that DHP described the journal while he was in the home with praise and a positive description. It was only after he was asked to leave that he suddenly had these other revelations as to sinister content. His claims have since acquired urban legend status.