It's a matter of interpretation. I could just as easily say that being under the same dome with everyone else means you're in it together, whereas with a spherical earth, there are thousands of kilometers of rock and magma between me and people on the other side of the earth. Also the existence of space and other planets means there is hope for an eventual total separation from the third world hordes. White people can move on to the stars and earth can become a nature preserve and oxygen farm. Eventually we could even speciate into many races, all greater than we are now.