On balance it probably is better to keep threads where they have started, only moving them early on if it's clear there's been a mistake.

The distinction between music threads and BS is a pretty ramshackle one anyway, and that's how it should be. When you're talking about a song you get into talking about whatever the song is about, which is likely to be real life, how the world is etc - and when you're talking about anything often the best way to get a point across is to use a song to illustrate it.

I imagine there are people who don't bother to look at both sections. More fool them.
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The idea that the personal behaviour of singers, or writers or artists should be a reason to avoid using their works is profoundly wrong to my mind. We don't apply it historically - no one suggests we banish paintings by Caravaggio because he was a murderer.