By that point, he reportedly had no close friends and few real personal connections. The departure marked the end of a highly visible academic path and the beginning of a far more isolated life.
Retreat to Montana
There, he built a small cabin by hand. It had no electricity and no running water.
Inside were only the basics: a bed, a stove, a few chairs, and books. His stated goal was self-sufficiency.
He grew food, read extensively, and traveled into town by bicycle when necessary. From the outside, it could be seen as the life of a man rejecting modern convenience in favor of independence and wilderness.
Over time, however, the withdrawal took on a more hostile meaning. Kaczynski later described a 1983 moment as especially important, when he returned to an area he valued and found that a road had been cut through it.
He said, “It was from that point on I decided that, rather than trying to acquire further wilderness skills, I would work on getting back at the system.”
Even so, the movement toward violence had already begun before that point. The retreat into nature did not remain a private lifestyle choice. It became connected to a growing desire for retaliation.
The Beginning of Criminal Acts
By his own later account, Kaczynski had already been engaging in smaller acts of sabotage since 1975. These included arson and traps placed near developments.
He also immersed himself in philosophical writing, especially the work of Jacques Ellul. One book in particular,
, became, in David Kaczynski’s words, his “Bible.”
His opposition to technology and modern industrial society grew into a fixed worldview. What followed was not sudden or chaotic, but deliberate and sustained over many years.
A Long Campaign of Violence
Between 1978 and 1995, Kaczynski carried out a bombing campaign that lasted nearly 17 years. During that period, 16 bombs were sent or delivered across the United States.
His targets were selected with care. He researched individuals and institutions in libraries and focused on people he believed were contributing to technological development and, in his view, to the destruction of the natural world.
The targets included universities, airlines, computer stores, and business executives. The attacks caused widespread fear and left lasting damage.
Three people were killed and 23 others were injured, many of them permanently. The first bomb in 1978 injured a university police officer in Chicago.
Another attack wounded a graduate student at Northwestern. In 1979, a bomb on American Airlines Flight 444 forced an emergency landing after smoke filled the cabin, and investigators later said the device could have destroyed the aircraft.
