Well, when those like myself attempt to change history... like the History Revisionists do, anything that contained their visage in it will have them erased and then soon any traces of their having existed as anyone knew it will be lost. But, I have a photo.

[ He brings a photo and shows it to her. Its of himself and everyone in the citadel. ]

Everyone is here in the photo, including the person in the memory that had himself erased from the photos back home, and was surely trying to change history...so, isn't that strange?