Sometimes people say terrible things when they're scared. They don't mean to, but they can't help it. They lash out because if they can see that their words hurt someone else, it makes them feel as if they aren't completely powerless.
Jonathan Maberry (2012). “Tales of the Rot & Ruin: Rot & Ruin; Dust & Decay; Dead & Gone, a Rot & Ruin story; Flesh & Bone”, p.684, Simon and Schuster