A single the 1 hand you have acquired the genuine existence realities of Darth Vader is in the other movies so he just cannot kill him. But that is clear and not seriously the situation we’re speaking about.
Back again on Mustafar, Obi-Wan was ready to destroy Anakin. In actuality, he imagined he did get rid of Anakin. And now that the two are combating yet again, we get the perception this combat begins the same way. Obi-Wan is all set to stop him. By the conclusion however, we see a essential manifestation of Obi-Wan’s aware. He’s fewer inclined to destroy “Darth Vader” than he is “Anakin” and considering that Vader claims he’s killed Anakin, Obi-Wan form of sees that as unfortunate acquire.
And yet, this is a very important miscalculation. Obi-Wan has no problems killing Sith. He’ll get rid of Darth Maul once again in a number of decades time, this time for good. But his sympathy for the tragedy of Anakin Skywalker listed here success in an inability to end the position and, as a final result, doom the life of billions, especially if you imagine about Alderaan. So we know why he did not kill him, but that was a blunder.