Yes, but why do we wish to continue the race?
You ask an excellent question, despite the title of this thread. However, the reply is not simple:
Life has evolved to survive. Obviously, if it hadn't done so, it would have gone extinct. By definition, life survives. As species adapted to their environments they became more complex in their genetic makeup and biological processes. Correspondingly, so too did their behaviors become more complex. And, therefore, survival became more colorful. As brains and nervous systems evolved, instincts eventually came into being. Survival took on the appearance of actions...the "Four Fs of Survival," if you will: Feeding, Fighting, Fleeing, and sex. Later on arose human beings, and with our advanced sentience came the power of conscious thought, and a new class of life came into being: a life of purpose, rather than survival.
Meanwhile, everything within us contributes to our survival, if not today then in the past. All of our biological functions and instincts are correlated in some way with survival. Our
nature is to survive. And now that we are sentient, our
willpower itself is drawn to stay in tune with our nature. Every one of our behaviors that have even the slightest degree of whimsy in them are predicated at least in part upon survival-oriented behavioral instincts. This is chiefly the answer to your question. However, with the power of conscious thought, we do have the means to choose behaviors that do not necessarily correspond to our survival. And, furthermore, many of these behaviors are highly abstract, well beyond the simplistic intricacies of the rest of nature. Civilization has progressed so rapidly, and human thought has progressed so far beyond the basic compulsion to survive, that many of the behaviors and ideas open to us do indeed contradict our
biological prospects for survial. But this is offset in that, to the extent our immediate survival can be secured, our indefinite survival (as individuals) is more dependent upon
sociology than biology, and the history of civilization has trended in this direction throughout history, as we would expect.
So, in a more thoughtful way, we choose to survive not only because it is in our biological nature to survive, but because the
will to survive has also evolved, culturally, to be in our sociological nature as well. This is not guaranteed, and humanity forever stands but one massive Heaven's Gate from oblivion, yet let not this cognitive peril keep you awake at night. Take it as I do: A motivation to succeed. In my mind, survival is a prerequisite to success...not only for myself, but for our entire species.