To the Op.
I think that the answer to you question is a combination of many of the answers you have already received. Certainly the cost, listener base, ambiance they want to create all come into play. I don't listen to the radio very much, myself, but when I do, I notice that the great majority of what I hear is pretty much middle of the road, non-controversial (ie: 60s/70s war songs). Think of it a little like elevator music or background music.
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