I only recently read it and I was surprised how he predicted social media and it's consequences (although certainly was speaking of existing things but wow so dead on in many ways). He could have published a book and not needed to bomb anyone.
I read both Ellul and OP in engineering ethics class in my underground. But fair point, most of my colleagues were pretty disinterested in the material.
Reason is Kaczynski was actually a genius intellectual that went mad. His observations in many ways are completely accurate. His solutions are naive, as he thinks these things could have been corrected. They must take their course unfortunately.