I'm A Banana
Potassium-Rich
So let's say you've got a party of D&D classically defined "evil" characters. Someone in their group casts an alignment revelation spell. ... How do they perceive or interpret the information about themselves?
In D&D?
In D&D, they just say "Yes. I'm evil. And what are YOU going to do about it?"
There's no real stigmata associated with D&D evil the way there is in the Real World. People accept evil, tolerate it, acquiesce to it. Evil exists as part of the universal framework, as much as electrons exist as part of our universal framework, so the idea of "destroying all evil" makes about as much sense to most D&D philosophers as "destroying all creation." Evil is a valid and functional path to power and glory and immortality, even, if one doesn't mind a lot of suffering, a BETTER one.
In most D&D societies, even when an armada of Paladins are running the show, people blip on the alignment radar as Evil without so much as a blink. In the armada-of-Paladins scenario, maybe they're watched EXTRA close. But it's rare that evil, in and of itself, is an excuse to do anything.
It's not like the real world where people who do horrible things seek to justify those horrible things so they can still wake up in the morning and look at themselves in the mirror be secure in the knowledge that they're not awful people. D&D characters don't really have that kind of moral crisis unless they're falling or changing alignment. D&D characters can embrace evil. And nothing bad, generally speaking, will happen to them.
Well, I mean, the afterlife, sure they're a zit on the rear of some vrock, but before they die....eh....nothin' too horrible. And even after they die, there's the proverbial snowball's chance they'll rake their way up the ladder sooner or later and be more powerful than they ever were in life.