I don't think it had much to do with Pegs wanting to kill Pippin, she doesn't seem bloodthirsty (especially considering she breaks down after killing John in the Maller attack).
I think it had more to do with Michael being protective of Pegs and that he didn't want her anywhere near Pippin, who at that point could not be trusted and was thought
to be dangerous.
Also Datu being the mole? I don't remember anything that could potentially lead him to do any harm to the tower.
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