Casshern (2004)

Imagine if you will, a world in which there is only war. A world where the men in power enjoy a certain lifestyle, one of luxury and relative peace, but for everyone else, it is the direst of times. Add the aesthetics of a Japanese version of Sky Captain and the World of Tomorrow. For the story, use the age old avenging son plot, with equal parts Frankenstein and Akira rolled in to it, and you have Casshern.
In the context of this story, Casshern is the angel of peace, a deity of love and harmony. The character of the same name everntually becomes the deity and decides that the only way for there to be peace is to kill them all. I don't just mean the bad guys, I mean everyone, until just he and his wife are left. But don't worry, the spirits of the dead form a laser that shoots across the galaxy to smack into some planet, a ball of rock really, which it terraforms into paradise.
Yeah, I don't get it either.

Casshern at IMDb