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Because he felt he had nothing more to live for after Nunnally seemingly died and learning that everything he ever thought he knew (his father was an evil bastard that murdered his mother and he needed to defeat him to avenge her and so that he and Nunnally could be left alone) was all a lie and basically everything he did in his life was for naught, and wanted to die, so he figured he might as well make his death useful.
Then Nunnally turned up alive, but it was too late as he had already started the plan and it was too late to back out.
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