Some mutants chose to leave. In their eyes, Krakoa was another failed attempt. Their leader had gone mad and wanted to send them to their deaths. The plan to rebuild a utopia could never be completed. They might as well go back early and drag out what little time they had left.
The White Queen was not that pessimistic, but she chose to leave as well. Because she had also realized that she and Krakoa's two remaining leaders were not people walking the same path. They might never be able to understand each other. If they continued to coexist, they would only tear Krakoa apart.
Sebastian, however, chose to stay. Not because he valued affection or loyalty, but because Magneto's unwavering choice to shelter the vulnerable group benefited him, who was now part of the vulnerable group. So he was willing to stand on their side.
Many mutants also chose to stay. Far more than Magneto had imagined, and they were not all Epsilon-class mutants. Quite a few Alpha-level mutants chose to stay as well. Though they knew they might become candidates for the next strike team and go generously to their deaths like the strike team before them, they still chose to remain.
And Magneto's decision spread throughout the entire world along with the mutants who left. Many people said he had gone mad, and many others laughed at him for being stupid. But every national government treated the matter with utmost seriousness. Because this was, in truth, a terrifying signal—the mutants were gathering their ethnic spirit.
The mutants of the past had never had much of an ethnic spirit. Of course, some might think their ethnic spirit was "resist oppression and stand independent." That did count as a kind of spirit. The problem was that what they opposed