alt Hacker NewsBest explanation for vampires not liking crosses I have ever seen. I always enjoy vampires that are explained scientifically for some reason in fiction, its like some sort of challenge and they usually avoid the whole dislike of crosses, not here, thought it was a decent attempt along with many other ideas in the book, very enjoyable to me.
My favorite explanation for it - and I forget where it's from, but it probably isn't uncommon - is that vampires who were humans raised in Christian cultures believe themselves to be damned by God when they turn because that's what the folklore says, and that belief and self-hatred manifests as a phobic aversion to religious symbolism.