No, these subway ads aren't from an alternate reality at all. They're from history. And yes, that does appear to be a child laying in a pool of his own blood, while a man walks over to make sure he's really dead.
I live in New York City. Everyday I ride the subway to work; most people here do. I haven't owned a car in 10 years. I live in the densest large city in America, one full of massive skyscrapers, immense culture and people of every race, culture and creed.