Until our basic needs are taken care of, we don’t have time to sit around and contemplate, “Why are we doing all this?” We just survived, if we were lucky or skillful enough. But all animals survive. What differentiates us from the animals is that we ask “Why?”
The ancient philosophers looked up at the sky and wondered, “What is this all about? Why are we here? Did anybody, such as God, put us here? Who are we? How can we be at peace within ourselves, now that all our needs are met?
The Stoic philosophers, the Buddha, Lao Tsu, and so many others realized that we have the capacity to reason, figure things out, and find a way to live at peace with ourselves, nature, and each other. This is why philosophy came about. As humans we have the unique capacity to contemplate our own deaths and frame our lives accordingly.
Of course, nothing can really be known with our limited brains, and we can debate about objectivity and subjectivity forever. But that is not the point. We are philosophizing animals if we live beyond the survival stage. And we will continually wonder why.