Have I told you before about John C. Wright? He was the author of one of my favorite series, The Golden Oecumene. In your terms, he was parasitized. He had a stroke, and he heard the “voice of Jesus” in his head, and Jesus told him to hate feminists and Muslims: https://www.ncregister.com/blog/an-interview-with-catholic-sci-fi-author-john-c-wright Now he’s friends and mutual enablers with Theodore Beale, of all people, because their brands of hatred are compatible: https://en.m.wikipedia.org/wiki/Vox_Day

Wright is what I always come back to when I talk about belief. There was a bent place in his thoughts, where no matter what he believed, he thought the only possible reason you could disagree with him was because you weren’t as smart as him and hadn’t read as many books. He simply switched from saying you hadn’t read or understood the atheist books to saying you hadn’t read or understood the Christian books. So maybe he wouldn’t have broken if he hadn’t bent first, or would have broken in a different way? But other times, I fear that it wouldn’t even matter, and the same brain damage would make me hateful in the same way.