History shows that a great song (especially in the US) can serve as an anthem or mantra for all sorts of things. A song can grow into something that's bigger than its source. Any artist that has had the honor of being part of such a phenomenon should be flattered and not angry. Songs, movies, books, inventions, ideas and more are the very fabric of what we are as a race. When you offer something up for to the world, you have to be prepared for what may happen to it, how it will be used and who will use it.
Maybe the GOP should counter sue for discrimination?