I agree perfectly with Irish Farmer and JCL both.We can keep on going deeper and deeper but we can always add a Why to anything we explain.Newton discovered gravity
but what causes gravity ?.Evetually it seems we have to accept that its the inherent property of that entity(like space or time)
It goes on and the rabbit hole
unfortunately never seems to end...but yes,it does not mean that we stop thinking and as JCL says that maybe universe was a necessity..such a cool thought to ponder while I go to sleep

Maybe such questions can be explained with a "circular" reasoning..like A is because of B and B is because of A...atleast this way the questions will end...
just a wild thought