Itachi had done many things in his life that he wasn't proud of. No matter how one tried to justify it, he had committed unforgivable crimes in the name of what he thought was right, and in the end, all that hadn't even contributed to making Sasuke's life any better. He might not deserve this second chance, but now that he was already in the past, he intended to change everything.

Gellert Grindelwald had spent many decades sitting in his little cell reflecting on his life and thinking about the atrocities he had committed in the name of the Greater Good. So, when the day came on which his successor sought him out for the knowledge he possessed, he refused, wanting to do one last good thing before he died. Unfortunately, Death wasn't done with him yet.