" Why should they be afraid of us? We aren’t hurting them,’ she broke in.

“I’m not sure that I know why,’ I told her. ‘But they are. It’s a feel-thing not a think-thing. And the more stupid they are, the more like everyone else they think everyone ought to be. And once they get afraid they become cruel and want to hurt people who are different – "

― John Wyndham , The Chrysalids