I think there are only two possible answers to this question - random noise or the whim of the one above all. If you accept the first, then there is no further questions. If you accept the second, then the next question is what was His purpose? It would be hard to believe that all reality was done on a mere whim. Consider that...
Nah, there is only one possible answer to this question - "I don't know, and neither does anyone else".
If you want to pretend that you know, you might be able to fool yourself; but you are not fooling me.
You don't know, and your claim to know that it is 'the whim of the one above all' is so obviously unfounded in anything but your desire to avoid admitting that you don't know as to be proof positive that you really don't know.
Perhaps a better and more fundamental question is 'Why are people so reluctant to admit that there are things they don't know?'