It's not necessarily tasty, but it isn't super fast, we're not venomous, poisonous, spiky, or armored, we can't smell very well, our claws and teeth are relatively ineffective, our young are pretty defenseless for several years and we only have a few of them...we need all the inventiveness and precautions we can come up with to not be the easiest meal in the forest. Predators don't really care about tastiness, they just need to feed.