Oh, for crying out loud, Bricker.
Why worry about the river dolphin? Because river dolphins are amazing creatures and it’s nice to live on a planet with river dolphins. It sucks that they’re going to die, because now we won’t have any more.
Would I want to live in a world that had trilobites? Hell yes. I want the thylacine back, I want the dodo back, I want the moa back, I want the elephant bird back, I want the Archeolemur back, I want Thylacosmilus back, I wish I could see and appreciate every extinct species that ever lived, because animals are interesting to me, and it sucks that we’ll never know what a Sivatherium was like, or a woolly mammoth.
Of course there’s no “right” for a species to exist. Yeah, the universe doesn’t care. The universe doesn’t care if the Mona Lisa exists. It’s just a scrap of canvas. The universe doesn’t care if you exist, or if I exist. The universe doesn’t care if a baby gets run over by a truck. Does that mean you watch unmoved when the baby is sitting in the street, or do you run over and take the baby out of the street? Why would you do such a thing?
Because you, as a human being, value human life. You, as a human being, also value things that aren’t human…art, music, a good car, a chocolate bar, who knows. Maybe you don’t care for everything everyone else does, and can’t understand why someone would value the Mona Lisa, and you wouldn’t shed a tear if it were destroyed. But someone with human empathy would understand that the rest of us DO value it, and so to refuse to take steps to save it…or that baby in the street…or a freaking river dolphin…is an asshole move.
It has nothing to do with the universe, or evolution, it’s about humanity. What do WE want for ourselves? And even if some of use can’t see the value in an animal species, the trouble is that extinction is forever, as the cliche goes. We can’t change our minds later, now that we wish we had some dodos around. It’s a one-way ratchet…on the scale of human history. Sure, 30 million years from now there will be new species of flightless birds on uninhabited islands. But that doesn’t do any good to us today, or tomorrow, or for the next couple thousand years.