I find this hard to follow. But you seem to be positing that because adherence to rule X is motivated by reason Z, it is therefore permissible, or even desirable, to suspend or override rule X whenever someone believes that doing so will better advance reason Z.
I go a bit further than that, I think. One might read a rule like Rule 0 and think something like this
"
Aha! I grasp that rule, and I see its consequences, and thus if another upholds it I will be able speak to that with accuracy."
That runs into a conflict when one is using that grasping to make arguments as to the
undesirability of following that rule. One may come to think something like this
"
Why are these fools following Rule 0, when it is so patently unappealing?!"
Do those fools understand Rule 0 to be
unappealing but follow it anyway!? Or do they follow it out of plain ignorance of its consequences? Perhaps they find the unappealing, appealing in some way - a matter of taste? All of these are possible, but they are also problematic. They skirt reliance on a challengeable assumption that one's own position is one of holding the high-ground (hence I call them "
fools" so that we are clear what ignorant persons of questionable taste they must be.)
Alternatively, their grasping of the rule - and this is what I believe
@Thomas Shey and I have been essentially saying - is one that has
appealing consequences. The choice of following and the manner of following (the rule that is followed) are not neatly divided. [This is a narrow claim, specific to game rules.]
Those fools are grasping and upholding an
appealing version of Rule 0 that is
not identical to the
unappealing version grasped and upheld by those up there on the high ground. (Note that there is no reason to suppose those fools are insensitive to possibilities such as accepting that the sting of loss adds pleasure to future victories: they need not be unsophisticated fools.)
EDIT Just to note that I wrote that way in attempted humour, and not mockingly. I hoped to get some ideas across, but with some levity. Less heavily and sternly in opposition. More to build upon.
Look at Vincent Baker's example of the fight to try and get to the departing ship on time. The player (via the play of their PCs) wins the fight - their PC "kicks the other guys butt". But does the player get to the ship? In Classic Traveller, 5e D&D, Rolemaster and CoC - just to point to a few example systems - that question is answered by a GM decision. The decision may be made in various ways, and typically may have regard to the PC having kicked the other guy's butt, but the GM makes the decision.
Now consider a 4e skill challenge, where the stated goal is to get to the ship before it departs. Winning the fight will count as a success in the challenge. So the connection between winning the fight and getting to the ship before it departs is not hostage to GM decision-making.
Wtih that all in mind, would you say that a group that chooses to
not accept/enact Rule 0 for themselves (which is more common in neo-trad 5th edition play) therefore evades these problems? Or at least, is not committed to them.