@croydon - I'm a little bit torn over that to be honest. In some ways, I think that expressing fear through movies and games is a good way for children to get over their worry.
I don't remember who said it, but there is a famous quote that states that children don't need stories to tell them there are monsters. That's something they already know. They need the stories to tell them that monsters can be defeated.
I think, if you make sure the child knows that they can depend on you and you will always be there for them, they will feel more secure. And if they are given the tools to understand their fear and any potential dangers, they will learn how to overcome them.