Asking why there is something instead of nothing is like standing at the South Pole and asking which way is south. It combines circular reasoning with eternal regression, and the question can be asked only because something --- us --- exists to ask the question. Various answers can be given: it all just happened, God made it, we live in a simulation run by an alien teenager in his bedroom, etc., but ultimately we just have to accept that what is is. We are at the South Pole; there is no farther south to go. Pondering the question beyond that only results in a headache.