It's all very tiring going over the same old ground. The nub of the matter is that SM was very ambiguous and evasive with regards to his brother's whereabouts -- both during the investigation and on the stand -- when it should have been a simple yes or no answer; the fact that Shane changed his story at least 3 times in one week, combined with said ambiguousness and evasiveness during both the investigation and court proceedings, is very very telling. SM had a rare unambiguous moment in court when he finally conceded, as per his now uploaded transcript, "I genuinely don't remember seeing my brother that day." And there you have it. He finally admitted that Luke wasn't home between 1650-1715 (my guess is that LM was home between 1840 -1920, before setting off to meet the boys in the abbey). Yet, he had said previously he had spoken to LM in the kitchen at 1715, when LM was mashing tatties; it was lies. So, why lie? And if LM wasn't home, where was he? Of course, logical thinkers know exactly where he was. And the rest of the considerable circumstantial evidence really does all fall into place, doesn't it? The sightings of this solitary lad with the distinctive clothing, this solitary lad who eyewitnesses said was looking up to no good -- it really all does fall into place like a glove, does it not? That mountain of other circumstantial evidence ... Occam's razor. Guilty as all hell.
AD AT saw right through SM and knew he was lying. He showed SM photos of Jodi's slain body, whereupon SM recoiled back in horror and asked for a drink of water and a moment to compose himself; the guy was clearly shaken and disgusted by what he saw. AD AT then said, and I quote, "These images are not nice. You look a bit shook-up, but I want you to understand what we are dealing with here." SM, wiping away tears, said: "I genuinely don't remember seeing my brother that day. He could have been there." I would suggest that SM had a moment of compassion after seeing the state of Jodi's body, and this prompted him to do the right thing and tell the truth. I also think that, deep down, SM and PM will never ever fully forgive LM for his heinous crime -- even if he's ever released. Also, as I understand it, LM's uncle (the one he attacked with a baseball bat) thinks LM did it, calling him "a little b........".