Most people either thought Dick had no fear, from the way he threw himself into everything with his whole heart or just thought he had normal fears, like losing his family(again) or the end of the world.

But Dick had been through those fears, conquered them, stood on their dead corpses, and persevered to the other side.

Dick's fear was more insidious, and one he'd never been able to even face, his own darkness and his own capacity to do exactly what his villains did.