Looks like Richard Dawkins needs another hug.
But it seems to me the big "why" questions are, why are we here? And what is our purpose in life?
It's not a question that deserves an answer.
Well, I think most people would say those questions are central to the way we think about our lives. Those are the big existential questions, but they are also questions that go beyond science.
If you mean, what is the purpose of the existence of the universe, then I'm saying that is quite simply begging the question. If you happen to be religious, you think that's a meaningful question. But the mere fact that you can phrase it as an English sentence doesn't mean it deserves an answer. Those of us who don't believe in a god will say that is as illegitimate as the question, why are unicorns hollow? It just shouldn't be put. It's not a proper question to put. It doesn't deserve an answer.