Maybe people find happiness in the journey instead of the destination, mistakes and all? Wonder drives man, answers do not. Once man discovered the sun was a giant ball of gas and plasma he didn't repeat the verse over and over for the next eon. "Well turns out the sun is gas and that's all there is to know"
He wondered what gas, how much gas, gravitational factoring, and how does the fusion actually work?
With free will you will fail, it's guaranteed. But with failure come knowledge, light and a path towards new understanding that replaces faith with proof that solidifies our beliefs of the world.