It may take psychic powers to know with absolute certainty that a particular song will trigger someone in a particular audience, but to know that a song like “Blurred Lines” might trigger someone only takes empathy, common sense, and a willingness to listen to people’s concerns. Even if everyone makes a reasonable, good faith effort to avoid songs that are likely to traumatize people, there will still be occasional mistakes. But if we can get rid of 90% of the problem just by being thoughtful, that’s a big deal.