Why don't Demosthenes and Locke want ender brought back to earth?

Demosthenes and Locke, pseudonyms used by Ender’s siblings, oppose bringing Ender back to Earth because they recognize the potential danger he poses as a military genius. They understand that Ender's extraordinary abilities could be exploited for political gain or lead to further conflict. Additionally, they want to protect him from the societal pressures and expectations that await him on Earth, as well as preserve his autonomy and the ideals he embodies. Their motivations stem from a mix of familial loyalty and a desire to keep Ender safe from manipulative powers.