Extinctions are often caused by competition from other species. Human activity is just that: species competitiveness. It is part of the rich tapestry of life that we happen (at the moment) to be a dominant and very successfully competitive species, just as others have been in the past. I agree that we should do our best not to cause extinctions by carelessness and I also agree that we tend to get emotional about the pretty species and don't give a damn about the nastier ones. Who would really care if malaria-causing mosquitos went extinct?
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