Alternatively, most people don't want to hear about such things in music because it's an escape for them. When I'm listening to music its because I want to zone out and forget the world. Often because I'm stressed or overwhelmed. I can relax to the music and drift off.
Every other part of the world is enraged about social issues. Social media, news, TV and movies, advertising, politics, idle chit chat, even the products you buy when they have banners and shit on them. Art can be used to heighten social issues but it's also used just as frequently to hide away from them and give yourself a reprieve from the storm.