They are able to see that a certain population can see that they are subhumans. And they don’t want that perception of them to exist anymore. Build offworld settlements, that just means the people who KNOW you are less than human will continue to exist elsewhere and probably judge you later – yes, how’d you guess our plan you braindead ones?
Black, brown, woman, Irish, all the people who don’t want us to see them for what they are. No brain in their skull. Why would people like that want us to escape? They’d prefer to live in ignorance of how far away they are from being good people. All they want is to erase the fact that you judged them, that’s what the left is.