We are trying to answer this question with our minds, so how we think about the question and if it can be answered will depend on how we think about our minds.

We are trying to answer this question with our minds, so how we think about the question and if it can be answered will depend on how we think about our minds. If you take the scientific position that are mental processes are the produce of material brains produced through natural forces, you will believe our thinking is limited in power, like anything material. And that being the case, at some point the mind will run into questions it cannot answer, and the question of why there is something rather than nothing would seem to be that sort of question. And if you think of the problem that way then you will just accept the mystery and go on to thinking about matters where your mind might make some useful progress. If you think our minds are the product of a God that understands everything, but made human minds limited, then you will also accept the mystery. On the other hand, if you hold, as in Platonism or Hindu mysticism, that the mind is non-material and one with the Infinite, then you will likely believe that humans who grow spiritually enough can at some point come to understand why reality exists. I think the waitbutwhy guy is philosophically in the first position but hasn't thought it out logically yet.