If we all had to learn for ourselves, as individuals, we'd still be sitting in caves wondering if it was safe to go outside. What differentiates humans from most (must be a bit careful with claims here) is that not only do we learn from our individual experiences but we learn from others. We have, in a very brief time (relatively speaking) moved from being hunter-gatherers to dominating the planet. Other animals on the Earth are doing exactly what their ancestors did thousands and thousands of years ago. Crocodiles still wait around in the water and leap at things. Humans have been to the Moon. Language and writing have enabled us to get out of the cave and into the skyscraper. Our ability to acquire and use shared knowledge means that we can treat each other's illnesses and not lay around in the back of the cave waiting to die.