Humans have the need to set, work towards and achieve certain goals. This is part of what Kaczynski calls the "power process", a process rooted deep in human biology. The primitive man, had clear biological needs and to provide for these needs was his goal. He had clear goals, a difficult but fulfilling path to attaining them, and the satisfaction of achieving them was especially fulfilling, as failing to satisfy his needs would result in death.
So modern man, deeply unsatisfied and demoralized with his way of life, finds other activities to satisfy his need for completing the power process. These are the activities that Kaczynski calls "surrogate activities". Surrogate activities include artificial goals that are set up simply to have something to work towards, in order to simulate the power process and search for some form of fulfillment.

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