I know that I sound like a broken record, but I think that Jake and Billy were both using methamphetamine. Jake's one photo with his scabs all over his face, and Billy with his white supremacist "Germanic" tattoos that are associated with certain gangs. Look into horrific, high profile cases in the past that make no sense and - surprise - methamphetamine shows up. Tex Watson (Manson family) and Tim McVeigh (OKC boming) both come to mind. Tex admitted to being high on meth when he committed those murders, and even though it wasn't highly publicized, McVeigh was supposedly involved with white supremacist groups and doing meth.