Artists ask the questions that make scientists uncomfortable.
We could trace back human evolution to the primordial soup, we could isolate the exact condictions that created life, we could track the formation of our planet, our solar system, our galaxy and trace the history of our entire known universe right back to the big bang and beyond.
BUT, our understanding is still within the limits of our perspeption. This isn't me being some wishy washy artsy fartsy type, but the limits of science, as we define it now, are very literally the limits of human understanding, and no matter how much we could possibly understand, there's still the scope for somthing more completely outside our feild of vision.
What it amounts to, I guess, is how you define 'all the answers', because you can go out and out and out, understand everything that can be possibly understood and still not be able to explain why there was anything to begin with.
I'm not even saying it's a valid question, but it's still a question, and it will still nag, infnitely, at the minds of cirtain people and for as long as it does, science doesn't have all the answers.