Jacques Ellul wrote about all this since 1954, and his 'Le système technicien' book covers all the Unabomber's material (and more) quite clearly, and even more objectively.
Its author was not terribly charismatic and had a somewhat counterproductive marketing strategy. In a world in which building alliances and finding sympathetic voices and supporters is critical to messaging, he burnt bridges (or blew them up).
All that for a message which is inherently less palatable. It's often said that news has a negativity bias, but that tends to be small negativities: petty crimes and small or remote disasters, not long-term, distant, and intractable existential crises.
Cassandra was ignored. Cassandra was, however, correct.
(Not all doomsayers are, of course. But judging a message soley on its conclusion, as is quite often the case, is tiself a major failure of reason.)
