>>535952056
Had you paid attention to the story, Wanderer didn't attempt to "erase people's memories". At the time, Irminsul's mechanics were a mystery so after realizing he'd lashed out against the wrong people, he thought he could undo all of the harm he'd caused by erasing himself from existence. Of course that's not what happened.
Also "people forgot his wrongdoing" is a bad argument anyway because almost no one knew he was responsible for it in the first place except maybe Yae who didn't seem to care in the slightest.