Simple premise: Nobody embarks upon a course of action they believe to be wrong. They may come to believe it to be wrong later. They may abandon it or regret it. But at the time, in the present, they do not believe that it is the wrong thing to do, or else they wouldn't do it.
Complex conclusion: There are no comic book villains. 'Ethics' is a term that, at it's core, distinguishes right and wrong behaviour. At a subjective level it has no meaning. We can all agree in the abstract that violence is wrong, but we can also agree that some violence is justified. Stealing is wrong, but occasionally necessary. And as soon as we move out of the mental constructs where things can be made black and white, the world gets very muddy very quickly.
This doesn't mean that ethics are meaningless in and of themselves, but the more subjective we get the more obscure the lines become. Eventually we end up with a sort of moral relativism, and the only way we can really create any clear definition of what constitutes 'the right thing to do' is by some sort of consensus.
I can't disprove your quote, because I agree with it. Don't fret though; the existentialist says that life can still be a grand adventure, even if it has no objective meaning.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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