Originally Posted by DA_Champion
That's true, if this is the origin of the no-kill rule, then that means they're always going to have to invent BS plot devices to prevent killing. It's extremely silly.
This is aside from the fact that "origin of the no kill rule" is not the reason they killed Zod. They were honest about it, the reason they killed Zod is that Snyder felt the original ending lacked closure. So, they added a scene where the fortress of solitude is destroyed, where Superman heat-rays a lot of Kryptonian embryos to death, and where he murders Zod to make the ending more satisfying. "Origin of the no-kill rule" is merely padding.
You mean where he kills Zod in self-defense, and in the defense of others, right?