Clear Channel memorandum (list of songs that program directors felt were "lyrically questionable" to play in the aftermath of the September 11 attacks)

Always has been. It has been a constant fight for those who believe in free speech and those who don't. Sometimes the believers are ahead, sometimes it's the non believers. Being ahead builds complacency and fosters resentment, ergo the back and forth. It constantly needs to be fought for or it goes away completely. The fight is never ever over.