[Sinfully Naomi]

That's a very good point. But still, losing ALL memories of the Death Note, his inner feelings should only have changed from the events happening. But, it does seem more likely that his morals remained unchanged. When he lost his memories he didn't want to believe that he was Kira, despite the fact that he questioned himself, he showed that he did not want to, nor would he take it upon himself to kill criminals as such. I still believe that he was corrupted by the Death Note for the reason. He also felt guilty after his first murder, as do many. He lied to himself to justify his actions, but still, the fact that he has to do that showed that his morals were changed in the process of using the Death Note.