On the contrary - these are the vertebrate species extinctions we know about. There are likely very many more we don’t, not to mention the literally thousands of insect/plant/plankton extinctions occuring every decade.
The point is that without human interference the ecosystem remains in equilibrium. The trouble with human activity is that it changes the characteristics of massive tracts of land very quickly. It seems a little harsh to suggest that a tree-dwelling creature might “adapt to its environment” when you’ve just chopped down all the trees in a hundred mile radius within six months, depleted the soil so much that grasslands become desert within a generation, or overfished to the point where the entire food chain is thrown into chaos.
Every year numerous new drugs and treatments based on natural products *eg.*deep in the Amazon become available. Species conservation should occur *even from a *selfish perspective.