The last male northern white rhino
The article frames man-made extinction as unethical toward animals. The real problem is the diminishing biodiversity. Every time a species goes extinct, we – as well as ALL future scientists – lose invaluable sources of data.As one door closes an opportunity is forever lost. The effects of man-made extinctions reverberate through time and fill the pool of 
unreachable truths (Hofstadter).It's unethical toward the whole human race as well.