Because it is just one of trillions of spinning rocks, subject to the same concerns than any particular grain of sand on any given beach would be. If we want o

Because it is just one of trillions of spinning rocks, subject to the same concerns than any particular grain of sand on any given beach would be. If we want our species to survive, we need to be more than occupiers of a single grain of sand. As to the first point, I think the poster was meaning that the stars' movement is not the main cause of the nightly patterns across the sky, the earth's movement is.