children don't have any power, and many may think that the person has some feelings for them, they trust far more readily than an adult, and if threats of death, or harm to their families, and being told they won't be believed, would likely mean they don't say anything.
not to mention that these cases go back decades, people who were famous, like Savile, people trusted them, and he is no different in that respect, a jolly man, artist and bon viveur,
adults can be swayed by this, so think what a child would do. tell someone and be branded a liar, and who would ever think that a childrens entertainer could do such a thing, Savile, Hall, you wouldn't believe it then, but now things have changed, shame that its taken so long