The movie can be summed up in one sentence: "What if Superman were evil?" As an aside, the most unrealistic thing about the Superman comics is that in some origin stories, he has his powers as a toddler. There is absolutely no way a toddler would be able to control ultimate power like that. Every time he gets mad or excited, there would be a pile of bodies in his wake. President Baby is the sweetest boy in the world, but toddlers are not rational!