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Animals kill other animals, in competition for food, shelter, etc. (and sometimes even for sport); human beings have been pretty good by this measure, pretty successful, though not nearly so successful as some others (like bacteria). Why should we feel any particular guilt for acting according to our biology and nature?

It's understandable why we sometimes extend our concern to members outside of our species -- part of our extraordinary evolutionary heritage is the capacity for empathy -- but this doesn't turn us into villains for hunting or being industrious.