I think it's only because it's unusual, and that makes it "sensational". I empathize with your argument, but I don't think there's a correlation. I'm big on wondering why women never notice the majority of violence in the world is against men, and demonstrate no feeling of injustice toward that cause. Similar reason I suppose only backward logic. Violence against men is no more uncommon than eating apples in the fall, so hardly anyone even notices, and I doubt they have since prehistoric times.