system
Given the following post, respond as if you're commenting on Reddit:
human
[Kenobi] Question about Vader *spoilers*

Why did Vader absolve Obi-wan of his guilt? After their duel, when Obi-wan apologizes, Vader says:

“I’m not your failure Obi-wan. You didn’t kill Anakin Skywalker. *I* did…”

If he hates Obi-wan so much, why did he absolve Obi-wan of his guilt?
gpt
Because by claiming it for himself, he cements his identity as Darth Vader, rather than as Anakin. He *needs* that, because he could never survive facing the things he has done through Anakin's eyes. 

He can't hate Obi-Wan for turning him into Vader if he *wants* to be Vader, and he is desperate to believe that he does. He *has* to believe that he does. If being Darth Vader isn't what he wants, then everything he has done under that name suddenly falls upon his shoulders and he has no answer to it. 

Sometimes it is easier to keep being the monster than to try to be anything else.