Re: "Common Sense" approach to rules (RACSD)
The main problem with the unconscious willing target argument is that there is no real way to apply common sense to it, since we don't actually know how mind-affecting spells work (do they change something about the conscious brain, or the unconscious one? If the former, it wouldn't work on unconscious targets since their conscious brain is turned off; if the latter, it would still work since their brain is still functioning, albeit at a lower level). So, it may be better to just drop it for the purposes of this thread.
Also Tippy, by RAW (I agree with your reading, just not that it is RAI) it would effectively make coup-de-graces on unconscious targets succeed automatically as well, since they would be "willing" to forgo the fortitude save, which my common sense says is ridiculous.