It makes absolutely no sense for there to be radio edits and blanket bans on explicit songs receiving air time. Music is the only form of communication that receives blanket bans by the FCC in this manner. TV shows and movies get different ratings, and as long as there is an appropriate warning label, it can show anything short of pornography. The moment a musician says any word worse than "damn," whether drug-related or a simple curse word, it's considered to be "explicit content" and they get censored and/or banned from the air. A radio station should be able to say, "we're going to play an explicit content song, so if you don't want to hear it, change the station." It's honestly ridiculous that such puritanical regulations are placed on a single industry.
/rant
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Um, if anything, that's because the music industry refuses to be regulated in the same way that the movie industry is. For instance, many alternative artists release music with explicit content but choose not to label it.