Comment by mrguyorama

It's not tautological because it's objectively wrong.

There is no biological purpose. We are just a multitude of chemical reactions falling down the entropy slope in a slightly odd way.

"Purpose" is a concept entirely made up out of whole cloth for hairless apes who accidentally invented language and that allowed them to do a lot of thinking outside the confines of their biological processes.

We are perfectly free to CHOOSE reproduction as a "purpose", but nothing about biology actually cares. If you don't reproduce, oh well, something else will take that spot in the ecosystem.