Which is better, positive or negative?
I have tried to find out how the authors determine positive and negative. Or what do they mean by positive and negative? Which one is better? No, the authors do not answer these question directly. They make no value judgment as to which is better.
But, from the way they are presented here, all positive instincts — Action, Fight, Acquisition, Association, Mating, Parental care are better than negative ones — Flight, Avoidance, Privacy, Refusal, Filial dependence, if you look at the pairs in terms of survival of the fittest.
Furthermore, all habits associated with positive instincts seem better than those associated with negative one.
My understanding is, those who possess predominantly positive instincts are in better position to compete and survive in the world.