Correct me if I'm wrong here, but isn't it the producer's job to decide what is and isn't suitable for broadcast? So obviously some suit decided it was fine, therefor that's where the actual blame should lie. It was a tasteless thing to do and I don't think it's funny at all, but that's what a producer is there for. If the production team has been letting them just run riot with whatever they like, it's hardly surprising it got out of hand.
Anyone can approach a radio station with an idea, but it's up to the producers what is and isn't put on a show.
I also understand that Ross has already been to the house with flowers and a personal apology, which is at least something.