As a seanan_mcguire fan (I read the ARC of her first book, ffs), and having met her personally, I have to say... she doesn't do things quickly or without thinking it through, and researching all sides of the angle. I can't really speak for her or any of the other authors, but from what I've seen, to [ask] to pull their stories, believing the account without a lot of research and a lot of heartache over doing so is uncharacteristic and completely counterproductive.

And I'm sorry if I mischaracterized any of the authors who have pulled out, but--in my fannish opinion, that's what happened. That's how I'd do it, anyway.