LOL... Yes, if we apply LOGIC (principles of reason), there certainly does have to be a REASON why. If you want to be ILLOGICAL, you will conclude there is no reason, and everything we know and understand in the universe is without meaning and purpose.
There doesn't need to be a WHY if you choose to take an illogical path, and assume all the magnificent universe is meaningless...void of reason. That's not my choice, I didn't choose that path. My mind is still open to all possibility. Yours is closed, you have made your mind up already, and it can't be changed. This is why you have the viewpoint of logic that you do, as it applies to our universe.
If we observe a salmon swimming upstream, logic tells us, there must be a reason. We then explore the possibilities. Eventually we find a reason why. We follow the path of logic to find out why... we don't draw conclusions along the way and say... well, the salmon like to swim, and that's it... and we don't make the absurd claim that salmon just swam upstream because of random chance... just because... Nope... we keep observing the salmon, we keep studying what they are doing, and we discover an answer... logic leads us to the answer as to why, but logic always dictated there must be a reason.
Presently, scientists are observing black holes. Logic tells us, there is such a phenomenon, because we're observing it. We can't explain it, black holes seem to defy our understanding of physics, and technically shouldn't exist... but they do... we see them. So, should we use YOUR logic and just conclude the black holes are meaningless and without reason? Or should we continue to explore the possibilities, keep asking questions about why they exist, what are they...where do they lead?
Most everywhere we apply logic principles, we eventually find reason and purpose. I can't think of many examples where we haven't. What caused the Big Bang? Can you answer that? What compounded all of the necessary elements for life in that first 'anti-atom' or whatever exploded into our universe? Got an answer to that one? Didn't think so!