I say that children are often very imaginative, have a harder time distinguishing fantasy from reality, and their reason/intellect is not as well developed. Therefore, some things might scare them which would not scare an adult.
Someone I was discussing this with said that if you didn't have a TV or watch movies, children wouldn't be afraid of anything. They are only afraid of things because they A) see an object and B) see adults/children reacting with fear to that object. So, in theory, if you never watched a single video, your children would fear nothing at all.
I disagree with this, of course. The person who expressed this belief is a more rational sort, as well as low on the imagination scale. I know very well that some children have very powerful and vivid imaginations.
What do you think?