Children are no more sentimental about their ignorance than they are about their size. They want to escape their ignorance, to know what's going on, and we should be glad to help them escape it if they ask us and if we can. But by the innocence of children we mean something more - their hopefulness, trustfulness, confidence, their feeling that the world is open to them, that life has many possibilities, that what they don't know they can find out, what they can't do they can learn to do. These are qualities valuable in everyone. When we call them "innocence" and ascribe them only to children, as if they were too dumb to know any better, we are only trying to excuse our own hopelessness and despair.
“On Seeing Children as 'Cute'", by John Holtd from
Escape from Childhood: The Needs and Rights of Children. New York: Ballantine Books, 1974.