I don't know about songs played by radio stations, but the end of irony nearly came about on LBO-talk in response to the WTC & Pentagon bombings, for some posters constantly insisted upon the conflation of explanation with justification, objective analysis with ethical injunction. Irony is beyond those who refuse to be clear-headed.
I hope LBO-talk will recover from the shell shock. Perhaps it has by now, with Doug Henwood back on the cultural front.
Yoshie