So this allegory tells us that humanity faces existential threats and that the answer is violence towards anybody who want to focus on another problem beyond his pet project. I read it as pretty deranged and unjustly angry. Along with the other articles on that site by Kaczynski.
It's actually a pretty interesting read so far. His thoughts on "leftism" and general society conformance seem to me to be quite well thought out.
I guess mental illness, and logical, rational thoughts aren't necessarily mutually exclusive.