wfz on 20 December 2012
Because the ultimate timeline of all lifeforms is evolution to become smarter and fitter to survive in your environment, and we are the prime example of such. We are the winners of our planet.
And there's also the fact that species tend to value the lives of their own kind over other species. You value what you feel you have a closer relationship with. Without specific bonds being made, that is generally one of your own species, right?
