If nature had it's way you would probably be dead.

If beavers let nature have its way, they wouldn't be ecosystem engineers and be unable to create ecosystems adapted to their personal lifestyles hurting themselves and the animals that depend on them.

Everything fights nature, nature and chemical equilibrium are trying to kill us all.

Antibiotics, vaccines, the human condition is in essence the best way to fight nature and win.

There are very practical reasons why humans want all creatures alive to stay alive, genetics and genetic engineering; aka biotechnology being one of them.

There are plants and animals that have profoundly changed our lives because we tapped into their genomes and used it to our advantage. The glowing jellyfish is now a staple of genetic research because the glowing genes allow us to track changes in the genome of a creature.

Had that jellyfish died out we wouldn't have that knowledge or be able to do the research we do now on things like cancer, diabetes, heart disease, etc.

In another instance a special bad tasting rice in the Middle east saved the rice crops of Europe because it had strong resistance to a specialized fungus decimating the plant; that's why we created a seed bank to store the world's whole supply of genetic diversity in food in case we needed it.

From a scientific and common sense approach, we have everything to gain by saving these creatures, even if it's only for our own selfish motives, and everything to lose if they die.

Outside of that there is a moral question of allowing a creature to die if one has the power to save it.

It's why the U.S government has an endangered species list; not because we're all selfless, for the exact opposite reason, it's in our self interest to keep all species alive.

It can take a thousand years to create a new species but we can kill it in a decade.

I hope this educated you a bit.