I believe I know the phenomenon to which you are referring, having experienced it myself. (I was in a bad way then. Doing better now. Still hardly believe I'm out.)
It's very painful. You can't stop beating up on yourself, and it seems obvious that you're evil. In my case, it wasn't so much that I questioned the diagnosis as that I assumed that regardless of whether or not it was correct, I was worthless; I believed myself evil for different reasons.
I wasn't totally correct. I wasn't totally wrong, either. Learning to sort that out, and have a more nuanced self-image, helped somewhat in bringing me out of that hell.
But please recognize that without clarifying, it does sound as if you are implying some things about us (that we act evil, or that Asperger's is easily confusable with being evil) that are not only untrue but offensive. I grasp that, being an Aspie yourself, you don't see that, which is why I'm not offended. You were unclear, and, in fact, that is a pattern with your posts here. (It used to be a pattern with me, too, in my face-to-face interactions. I learned some rules for how not to sound like I was threatening to kill strangers. It's no big deal, but you'll need to work on it.)
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I'm using a non-verbal right now. I wish you could see it. --dyingofpoetry
NOT A DOCTOR