Humanity's happiness as the species' purpose in living is selfish in itself. Our happiness is not the reason we are created upon this earth. If it does, then we should've just been given a very low iq enough to survive. Increase intelligence widens ones view so happiness is shot. Ignorance is bliss really has a grain of truth in it. What i think of our purpose doesn't matter. Since we are actually advanced enough to figure it out. Only thing is we hope that we live long enougj to fulfill it.