Bug. I was wondering the same thing.
As far as the rest goes, how does one justify the comments, when the offhanded suggestion would potentially kill the rider and do damage to other innocent vehicles? Seems to me the best thing for the radio station to do is just seperate themselves from the DJ's and admit they wouldn't support such comments.
Not that I have any beef with him, but you can thank Howard Stern for the "shock jock" popularity.