Most apex predators that people think of don't really attack humans. The ones that do are rare exceptions and are often found to be injured or outcast so unable to hunt normal prey. The biggest killer in Africa is the hippo but they're herbivores and just protecting their territory or something. Bears are one of the few that always see humans as food.

Sharks rarely attack humans too, despite the popularity of Jaws. I was always taught that sharks generally only bother to attack humans when they mistake us for another animal.

Maybe because we have less calories than, say, a whale. They should have done the math.

That's because humans don't go swimming where Orcas hang out trying to find something to eat.