Loughner's close friend stated that Loughner experienced a radical transformation in demeanor in the period leading up to the shooting of Rolle and Giffords. This is established fact per an ABC news article. Something does not add up.
People experience mental illnesses all the time that cause them to change personalities and go crazy. But, I can remember watching the videos of Loughner walking around a college campus with a video camera, and he was just talking nonsense that nobody could understand. People who went to school with him thought he was creepy as well. He was just another deranged shooter, just like this Holmes guy.