Is there any answer possible short of "it's god" that would satisfy you?
I'm asking because you are giving the impression that whatever answer you get, you will reply to with "but why?" and "that's just passing the buck down".
A fundamental thing about science is that we'll likely never have all the answers. You can always ask "but why?". That's not gatekeeping but the difference to religions which often times claims to have the final answer. (Ironically there is a lot of gatekeeping in religion since not everybody is permitted to interpret scripture as they wish.)