Not having a why defyś the rules of logic. Tigers eat goats, why ? Darwinian theories explain why. A photon can be a wave or a particle, why ? because apparently that is the nature of light, and light exists. A plant has clorophyll that responds to the light, why ? so the plant can grow.
since everything has whyś, why doesn´t everything in total, the universe, have a why ?
So, you do think about it, I thought so. You are comfortable with the answer being unknowable, I am not.
I think there are rational answers for most everything. Philosophy and theology are the disciplines that explore these questions and offer answers. The answers may be wrong, but they are comfortable and rational to me. That is better for me than being extremely uncomfortable with the idea that I am a brief anomaly in a massive universe that exists for no reason or purpose, other than to be the briefest existence possible in eternity