[BlackSilence]

^ to add to the list of abortion The Gazette's Guren apparently talks about it too if i recall right. I'm not sure if this one would count but they also have a song titled Taion that talks from the perspective of the kidnap victim. It was actually inspired by a case of Junko Furuta.
Also Amei/Amit has a few songs on the subject of fame in Freak Show and talks about female status in society in "Matriarchy".
Mmmm not sure if it would blend in but Miyavi's The Others have a thing or two on war, money and in general political stuff, with a very great message for music bringing people together despite of nations and skin colour. other song Real is also good. It's talking about how people are so immerse in technological world, appearance . His stuff is very uplifting and rather light-hearted though, nothing depressing but gets the point across. Both are in english though.