I was SCREAMING at Hannity to SHUT UP while Michael W. Smith was singing that phenomenal song, "She Stands." GOD, these people just never quit talking! I switched over to C-SPAN.
They get paid to talk, so unfortunately, they don't understand when to be quiet.
My feeling is that they don't intend to be jerks and cover up the speech. It is that they are taught to fill air, ad lib etc. when somebody is not talking. It is in their training to keep yapping, so I think it is excruciating for them to just have to let the speech talk for itself. In my mind, I think for a television personality, dead air is like silence during a date.....just excruciatingly horrible to suffer through for them. Thus, they feel compelled to say something, anything, to get through it.
It is how they are trained, unfortunately.