I think that Anakin needs to believe he killed Padme and along with her their children. Then after he falls into the lava pit and is resurrected as Darth Vader, he would be consumed with evil, anger, frustration...on the brink of losing it. During the scene in the med-lab that would explain his bi-polar converstion with Obi-Wan. It would also give a hint to why Obi-Wan tells Luke that Darth Vader betrayed and murdered his father, because the last time he saw him he had become someone/thing else. I just want to stress that.
D. S. are you kidding? I get some of my best ideas when I'm not working
