The first person who comes to mind is Albert Camus who won the 1957 Nobel prize for literature, and authored many writings which contributed to the ideas in the philosophy known as absurdism.
"...refers to the conflict between the human tendency to seek inherent value and meaning in life, and the human inability to find these with any certainty. The ...
I suppose you really meant to ask a why question rather than a what question since a what question would be better answered in a biology SE.
The answer to a why version of this question would be the same as the answer to the antrophic principle and similar questions that have to do with evolution - namely, if it didn't it wouldn't be here.