Even though he hated mankind, he still gave them everything to try to save them… god, its just horrible how it all blew up in his face. He lost his children, his lost his mind, he lost any sense of order he had left, and he lost the last person who was by his side.
Even his other half turned his back on him. Oswald lost his family to this cruel world, and still gave it the best he could offer to save them from the horrors to come, despite his hatred for mankind. Then everything fell apart and he was left with nothing. Even his life couldn’t be spared to undo the atrocity he created.
His hatred and anger made him believe he was doing good for humanity when he was really getting revenge for all he had lost.