I think that these quotes are the logical conclusion of prioritizing a rational organization of rebellion into a revolutionary force over other approaches to the anarchy...
ra·tion·al·ize: make (a company, process, or industry) more efficient by reorganizing it in such a way as to dispense with unnecessary personnel or equipment.
Kaczynski expresses this urge quite well with the following statement:
"all other issues must be subordinated to the problem of stopping the technological juggernaut before it is too late"
If you can accept the premise that all other issues must be subordinated to X,Y, or Z, then you have allowed for yourself a well-defined goal and a value that transcends among other things, individual people. I reject that premise because it demands a degree of objectivity which does not exist. All values are ultimately bound by the limits of subjective concerns; evaluation itself is a fundamentally subjective activity. The project of presenting evaluations as conclusions supported by objective facts is an ideological project, perhaps the ideological project.
There is nothing objective about "stopping the technological juggernaut before it is too late." Too late for what? For who? There is no strictly objective path from the conclusion that "the technological juggernaut" is harmful to living systems to the conclusion that "living systems are important". Moreso, there is no objective path to the conclusion that my individual desires, well-being, projects, and interests are less important than "stopping the technological juggernaut". So why would I ever accept that my individual desires, well-being, projects, and interests ought to be subordinated to that project? And from that conclusion, to the conclusion that it is also more important than others' individual desires, well-being, projects, and interests (the question you are asking)?
However, this all says nothing about following from a subjective premise to a conclusion that "utilizing people's weaknesses" is something that should or shouldn't be done. Good luck with that approach to propaganda though! Without all of the ideological bullshit, it becomes much more difficult to convince people that they ought to subordinate themselves and their project to your own.