"Still, as I believe I said last time, the one-on-one fighting game and the superhero comics universe are a natural combo, as both are concerned with larger-than-life characters beating the snot out of each other for one incredibly contrived reason after another. The broad incredibly contrived reason running through the Injustice property is a falling-out between Batman and Superman over whether or not killing people is good. Batman takes the position that killing is the uncrossable line where all negotiation breaks down and vigilance gives way to tyranny, where Superman takes the position that "Wah, wah! I'm really sad and cross and I'm not gonna tidy my room, so there!""