This passage would fully explains why 世上的好男人都绝种了 based on Darwin's theory of extinction and "Survival of the fittest". Darwin's theory of extinction stated that the those who fails to compete successfully with other species will either die off(extinct) or evolutes certain kinds of characteristic to suit themselves to the environment - turning them into another kind of new species. While the survival of the fittest literally means only those better one would survive. The whole meaning of this phase, in evolutionary theory the survival of only those organisms best able (fittest) to obtain and utilize resources. Those who can adapt to the environment and make full use of the resources only can survive. The both arguments are proved to stand for those extinct animals eg. dinosaur, mammoth, Saber-toothed cat etc.
Same goes with species 好男人. Both theory gives sufficient information about the extinction of this species. This particular species we are examine came from the genus of 男人, which are highly competitive among themselves. Studies show, this group of species 好男人 are relatively more lenience, less treacherous and are much more emotionally weaker than other species in the group. They tend to make themselves suffer rather than to hurt the somebody else. The natural characteristic of this weak species constitute a disadvantageous and unfavorable position for them in the system (which we generally known it as "relationship", the genus of 男人 are to "chase" or "court" the other genus called 女人. Or sometimes vice verse. These two genus interact with each other.) And hence, they are not able to compete with those of the other species in their genus. I am not going into more details about it, I am sure you can simply list out a number of good examples XD
Okay, they failed to compete with others; so what's the reverberation that comes after that. They are forced to evolve, metamorphosing themselves into another form of species by changing their specific characteristic. The hybird of this process evolve the original species into a new species called 坏男人 (having a stronger characteristic, less lenience and are extremely treacherous.) And those who could not adapt to the surrounding and evolve into a new species will die off gradually, due to the incompetence in the system. These two end result lead to the down fall of the population of 好男人. The 好男人 is now one of the endangered species. The number of 好男人 is getting lesser and lesser, and is reaching a critical in value. It is a species that will potentially become extinct in the future.
As a conclusion, the downfall of the population in 好男人 are due to several reasons. First of all is the relatively weak characteristic they have as a competitor in the system. The more deceitful genus 坏男人 would overwhelm their position and role in the system. Another important reason is the discrimination of the system itself towards the species 好男人. The genus 女人 is less interested to the characteristic of 好男人. They are more allured by the perfedious and deceitful characteristic of 坏男人.
End report, end of this crap XD