I mean considering how large other species can get, I don't think its that bold. And there's emergent technology to make it a possibility. That being said, demographic trajectories are trending down, not up.

Understanding why and how war crimes operate can help us design international institutions and norms to help prevent it. The International Criminal Court is imperfect and biased, but I'd imagine many war-lords since have second guessed their actions, or at least lived in fear after their horrific actions because of it.

Also, understanding war crimes can help us with teasing out culpability, which can help us bring justice to the victims.