No edition has a CE write-up that doesn't involve insanity. I've seen no CE examples in media that don't involve being off your rocker in some way.
This is 3e's take on CE.
"Chaotic Evil, “Destroyer”: A chaotic evil character does whatever his greed, hatred, and lust for destruction drive him to do. He is hot-tempered, vicious, arbitrarily violent, and unpredictable. If he is simply out for whatever he can get, he is ruthless and brutal. If he is committed to the spread of evil and chaos, he is even worse. Thankfully, his plans are haphazard, and any groups he joins or forms are poorly organized. Typically, chaotic evil people can be made to work together only by force, and their leader lasts only as long as he can thwart attempts to topple or assassinate him."
I think AD&D's CN is dysfunctional. It goes past insane. As for 3e's CN, first and foremost they follow their whims. Whims are done without thought. As an individualist first and last, while a CN person doesn't intentionally go after organizations or deprive others of liberty, if the whim strikes, they wouldn't hesitate to deprive someone of their freedom.
If your entire outlook on life involves following whims, you aren't a rational person. The types of insanity that result in CN rather than CE aren't going to be as destructive generally, but they aren't always going to be benign, either.
Was Jack Sparrow insane? He was certainly CN. His choices are driven by freedom, survival, and whimsy rather than ideology or cruelty. Deadpool probably qualifies as does Ash from Army of Darkness. Elektra from the Daredevil and Elektra movie was unpredictable, independent, and morally fluid without being portrayed as insane. Her actions reflect a personal code rather than societal norms.
For that matter I know people in real life I would consider CN - they obey the law not because they respect it, they obey the law because they don't want to end up in jail. Because they aren't insane.







