Your holding up Marxist Jean-Paul Sarte, and Emmanuel Kant, who's philosophical ideology is considred to be the basis for which Marxism is built on? You think those people did good for humanity? Are you nuts?
Should've know the person pushing back most against having kids is a teacher of the Marxist religion. This is what is in your schools people ... indoctrinating your kids with their religion that claims, "It's not Marxism, it's not a religion."
None of those people you mentioned had a full life experience.
It's your life, do what you want
That said, I highly recommend having kids. Adopt if you have to. You'll thank us later.