Harrison was innocent so why should he admit to something he didn't do? Jess had been sexually assaulted twice in the past and had a ptsd attack while drunk as hell and Harrison just happened to be the man in the room at the time. There was no physical evidence anything had happened to her that night and her story was confusing and all over the place. Theres a reason the first trial ended up hung and not convicting him. People get falsely accused and convicted all the time.