Manbearcat
Legend
The key disconnect here seems to be Good and Evil as cosmological forces. The character (or the player) is not judged against my personal standard of Good or Evil, but against the standard set by those cosmological forces, as described in the game rules, and as interpreted, possibly even modified as house rules, by the GM.
I see the key disconnect slightly differently.
The key disconnect I see is that:
1) These cosmological entities do not exist but as words on a page.
2) These alignment invocations are general rather than specific and where they are specific they may be, specifically, at tension with one another. Where there is tension there is not just tension of the 1st order, but of the 2nd and 3rd (and perhaps beyond).
3) Given that the cosmological entities of 1 above do not exist, then we have in their stead a very fallible (even if highly proficient) GM intervening and serving as oracle, understanding the prescriptive aspects of the divine but having to read the signs of the tea leaves/bones/chicken blood spatterings, et al.
The GMing principles of an alignment system, combined with the realities of the above, mandate a litmus test that must be performed by the GM to determine instantaneous alignment shifts or latent alignment shifts. It is not reasonable or productive to perform this evaluation in-situ as the introspection, negotiation, and overt evaluation inevitably brings play to a sputtering halt, rendering all tension and pacing disjointed and sucking all life out of the gaming experience.
As such, the GM must perfectly recall the PC's actions, and the context of those actions, that took place in the preceding session, have infallibly internalized the canon (Deity Domains/Portfolios and the ethos examples - eg respect for legitimate authority, respect for tradition, et al), and apply some kind of preconceived (hopefully not too fallible) litmus test, that I proposed upthread, post-hoc. Hopefully the "party to be tried" (in my experience this is very often a Paladin being evaluated on the C <=> L axis) is present for their evaluation and is able to make transparent their 1st, 2nd, and 3rd order reasoning for their "teetering on N or possibly C behavior" and defend their case.
The person may not be judged on your standard of Chaos versus Law. But the cosmological entities do not exist. They are words on a page. Of which must be comprehended and applied, with all prejudices and fallibility in reasoning along for the ride, by a mediator; the GM. So while there are words on a page as a constant, there are variables of prejudice, fallibility of reasoning, human perception that can widely diverge from reality, very imperfect information that must be in-filled (see prejudice, fallible reasoning, and human perception), much lower resolution of understanding of player reasoning (especially 2nd and 3rd order/long view intent) than we would like to admit, possible gaps in memory of events that transpired (or their context), some form of litmus test (be it algorithm or seat of your pants).
Butchering, throat-tearing Paladins are absurd anomalies (I've never heard of one let alone played with one) that are easily resolved without the above process. "Bob, you're obviously an idiot or you don't understand the implications on the tin where it says 'Paladin.' Play this blood-thirsty savage Barbarian or this war-torn Fighter and lets call it a day." Being arbiter of alignment shifts (and imposing instantaneous shifts or advising of latent shifts) on the other 99.5 % of issues (especially C vs N vs L) is where this conversation has real teeth. And those cosmological forces do not exist. There are only words on a page. A GM. A moral quandary. And imperfect reasoning, prejudice, widely diverging human perception, fallible memory, lower resolution understanding than we would like, and some form of litmus test. And the stakes are typically not low.