[thewayfarer]

Exactly. I have no idea. It would make sense for a large, capable predator to try out eating a human, but they just don't. Maybe humans don't have enough fat on them to be appealing? ...but orcas also eat birds, which don't have a lot of fat. Maybe because orcas are intelligent collaborative hunters, they have instincts not to eat other intelligent species like humans? ...but orcas also eat dolphins, which are similarly intelligent hunters.

I would also expect any large predator to spontaneously act aggressive at times, but this very rarely happens. Or at some point I would expect it to make a mistake and kill a human even though it doesn't actually want to eat him/her, but this has apparently never happened.

I find it all very interesting, but I'm at a loss to explain it.