Good post Highwaystar, and philosifical cause it touches the question of free will/choice or wether everything is predetermined.
I want to say though that there's a big difference bweteen temproary causes of extinction and permanent causes of of exitincion and thus avoidable cause of extinction.
Those hunters who killed the huge Moa chicken on New Zeeland are gone now, and the seamen who killed that ostritch-like bird who is extinct(forgot the name), and the safari-hunters who made that Quagga-Zebra go extinct, it all could have been avoided. Those species werent necessarily unfit for this world, they were just unfit for the event where man went on in a rage to kill stuff in different parts of the world.
So these species that are now gone forever were only 'unfit' for a very temporary time period of only a hundred or a few hundred years.
