I rather disliked it, but then I did go in with the expectation of an adventure yarn rather than a political tract.
I did find the illustration rather pointless- like, obviously, if evil people have enough power, and are sick enough, they can create a stable system of pointless oppression. -At that point it's GAME OVER, that's the most extreme form, -where everything goes perfectly (wrongly -for the wrong people)- of the state of things to avoid. I think investigating and dwelling on one of the worst of the worst case scenarios is rather pointlessly morbid. One must just avoid such and such taking of directions as far as possible. A worst case scenario would therefore be a a distraction.
My stance on it is that I can't judge whether it was, or how much it was, necessarry and useful at the time. I rather suspect that (by my system) its main merit was contemporary and political, thought I suppose I should reread it again with different expectations and see what I think. (though a second reading might be less important than a first)
It certainly is a very striking illustration, so if someone thinks it's not conceptually possible for thinks to be so stably wrong, it might be an interesting read for them. But then again, what if they can't conceive of it because their mind refuses to, because they intuitively feel that it would add nothing to be aware of such a possibility, but, potentially, fear?