We don’t even know if there is a reason or not. If stuff like cause and effect are properties of the universe itself, they they don’t necessarily have to apply to it coming into existence (and if time and space are merely a part of the universe with no equivalent beyond, then the concept of it being caused by something runs into the issue of there being no time before it for a cause to occur and no place before it for that event to happen in).
There could be some equivalent of all those things of course, that the universe exists within, but we can’t just assume that.
We don’t even know if there is a reason or not. If stuff like cause and effect are properties of the universe itself, they they don’t necessarily have to apply to it coming into existence (and if time and space are merely a part of the universe with no equivalent beyond, then the concept of it being caused by something runs into the issue of there being no time before it for a cause to occur and no place before it for that event to happen in).
There could be some equivalent of all those things of course, that the universe exists within, but we can’t just assume that.