ObiWan leaving Anakin them maimed, but not dead, in the actual film was rather weak. If you think about it, had ObiWan done the right thing and finish him off, he probably could have saved the galaxy 20 years of suffering. And it is not like ObiWan never knew Anakin survived. A few months after he gets on tatooine he has to hear of the Emperor's new right hand man, vader, who is kicking ass and taking names across the galaxy.
ObiWan had enough guilt on his mind the next 20 years in the desert without also knowing that Vader was still alive and he had the chance to finish him off right in front of him. If he fell into the lava, at least he could reasonably assume he was done only to realize later that he actually survived the fall. "What teh hell else could I do? I cut off his limbs and he fell into molten lava! How the hell would I know he'd live through that?!"
This post has been edited by Private Zod: 04 July 2005 - 08:48 AM