In a slapdash reply to an article I published at Slate, the evolutionary biologist Jerry Coyne provides just such a response. First, he pretends that the question “Why is there something rather than nothing?” means “How did the universe come about?” And so he has an answer: the Big Bang. I confess I find this somewhat cute, as if I had asked a child why there is money and he had answered, “Because there are ATMs.”
Michael Robbins (paywalled, I think).