A silence in which their thoughts and emotions are the most prominent features. Fundamentally, they are afraid of themselves. If for some reason you consider yourself an unworthy person and helpless, you may want to cover up your perception of this belief. You could use the radio or television or both to aid you in this endeavor. You might project your own sense of power and self onto the fantasies these two mediums cause to be projected into your consciousness and then live within those fantasies while acting relatively helpless in the fantasy that is your daily life.
Some people believe physical reality is all there is.
For them silence is especially scary. It opens them up to the unknown and the non-existent and needs to be covered up, at practically any cost, by perceptions arising from the physical world. All music manipulates the emotions. It is never emotionally neutral. Remember this when listening to music.