It's not procreation that's our sole purpose on Earth, however. Yes, Darwinian evolution posits that ability to procreate successfully shaped every species. However, I'd argue due to our consciousness, our ability to generate culture via language and history and tradition, our ability to manipulate the environment via tools and learning, these move beyond Darwinian evolution. Our culture and language and toolsets are extremely powerful and wonderful collective objects that are worth preserving and cultivating evermore.

Just ask yourself, wouldn't it be a shame if there was no one around to listen to Beethoven or Mozart, to look at Monet or Van Gogh Paintings, or to appreciate the sound of poetry or the movement of a dancer? I think denying that humans are social beings in a massive social network is easy, that way nothing we do really "matters" to the universe, even though it matters intensely to other humans.