Certainly another possibility.
I think if we examine closely, almost everyone either knows, think they know or assumes that their life has meaning and purpose - the reason they get out of bed in the morning.
Or maybe it's a habit. What's the purpose of running red lights? Or of dinosaurs? Nothing so far you mentioned proves the "intrinsic value" of anything except what we personally or as a society make up. I love that program "Life after People" that shows how the world and even our pets would do just fine if suddenly the humans were to disappear.
The world existed before us and could continue existing after us just fine. The entire human history is a series of scenarios with faceless players trying to make this world, indeed all of existence, about us.
On a tiny spec of dust in space, a blue dot no one is near enough to even notice, about as notorious as an ant that was hatched last week in my back yard.
Purpose and "intrinsic values" are feel-good constructs.