I was willing to trade a piece of my soul to stop our own extinction. Cissy, Draco, and myself did so in order to kill The Dark Lord, and I won't ever apologize for that. Perhaps that was my problem. I've become willing to compromise myself, my soul, to stop the Darkness. The Wand of Destiny - no, Deathsthick - was egging me on. But there will always be another villain. Grindelwald, Voldemort, Ragnok. No matter who saves the day and stops the monster, there will always be another. Evil is unlimited. I am not. The scars on my soul would add up, losing parts as I hacked them off to slay the bad guys. But it was finite; once I used it all up, there would be no going back. I would save the world and lose my soul. Others would come after me "for the greater good'.