Just finished Manhunt: Unabomber[1] on Netflix. According to the show, it was Ted Kaczynski's entire defense to rebuttal his charges saying forensic linguistics and the FBI agent who "cracked" the case had no precedent. The agent was in fact a traffic cop before becoming an FBI agent and had little formal linguistics training. Instead Ted's defense behind his back went with insanity and tried to get him to plead to "save his life". Ted chose to plead guilty instead of insanity fearing his ideology and manifesto would be ignored if he pleased insanity.