Saying no FAI exists in design space that could satisfy us is equivalent to saying nothing can satisfy us. In other words, if you are correct then the AI isn't the problem and humanity would be "straitjacketed" anyway.
I don't see how not being fully satisfied is a straitjacket. I'm saying that our (the mankind) maximum satisfaction may be when straitjacketed, because mankind isn't sane (and if there isn't any truly sane morality system edit: to clarify. if there is truly sane morality system, then mankind can be cured of insanity).
I was using the term "satisfied" to include all human preferences, including the desire to not be "straitjacketed".
If human preferences are inconsistent then humans still can't do any better than an AI for there is an AI in design space that does nothing in our world but would make similar worlds look exactly like ours.
I laughed: SMBC comic.