Why do people care who Satoshi Nakamoto is/was? It's like wondering the name of the person that created the wheel. Sure, I suppose I would be curious about the name of the inventor of the wheel, if nothing else to raise a beer to them from time to time, but ultimately the wheel is the important part of the story.
That is the natural behavior of humans regards the invention of something very important that has a special meaning for many.
At least for me it's common to wonder who invented things that I enjoy doing very much, like games I play, music I listen to, architecture style I contemplate, etc... I ask myself, who had such a brilliant inspiration to be able to realize that? The same goes with bitcoin.