what is your opinion on enders capability to redeem the buggers?

Apparently through her thought-speaking, Ender learns many collective memories of the bugger history, including the feelings of despair when the old queens realized that humans were sentient beings, not just non-thinking workers like the bugger workers. They realized they were severe murderers during the first two invasions. She tells him, "We are like you ... We did not mean to murder, and when we understood, we never came again ... We could live with you in peace."

When he gets back to his colony, Ender writes a novel about the buggers and their interactions with humans as though the queen herself was speaking. He signs his name as "Speaker for the Dead," and this idea launches a religion.