I think it was lone necromancer has something similar happen in that one they bombed his base. They were terrorists but he let them live and join idk the bullshit they said to make it "make sense" but they had whole arcs about him killing the enemy because it's the world they live in now and you grow stronger by doing it yet in the current arc he for some reason acts completely different for no other reason than a bad author needing things to go this way.