no, "god created it this way" does not answer for extinctions. if god created it that way, the species would not be extinct.
the part i think youre missing is that "survival of the fitness" is shown elsewhere, and used as a tool here to identify what the fitness is, and how and when certain traits were beneficial.
the case you are descibing is that all applicatioms of science(well, of anything) are circular reasoning. if you use newton's mechanics to predict motion of a mass undergoing acceleration, its circular because your result is proof of newtons mechanics, and newtons mechanics is proof of your result.
its just an "if and only if" relationship. that's not circular reasoning.
the part i think youre missing is that "survival of the fitness" is shown elsewhere, and used as a tool here to identify what the fitness is, and how and when certain traits were beneficial.
the case you are descibing is that all applicatioms of science(well, of anything) are circular reasoning. if you use newton's mechanics to predict motion of a mass undergoing acceleration, its circular because your result is proof of newtons mechanics, and newtons mechanics is proof of your result.
its just an "if and only if" relationship. that's not circular reasoning.