"You are not my student, Twilight Sparkle, but in this, I ask that you allow me to instruct you. Celestia neither asked for nor required permission from Erin in order to undertake this action. She knew that there would be dangers, and she chose to take the risk in any case. The consequences of her actions are hers alone, and it is not for you, nor anypony else, to ascribe the responsibility for those actions or the results thereof to anypony else. 