Did Obi-Wan do the right thing by drawing his lightsaber immediatly when he faced Anakin on Mustafar. It seems that he didn't give much attention trying to talk Anakin out of his idea for "his new empire". He may have lust for power, but don't many have that? Does that make you a bad person. 2nd thing is Anakin was planning to kill the emperor. Anakin could do it. He could have killed him if he was still complete and not half machine. So if Anakin killed the emperor there would be only one Sith left...himself. So if Obi-Wan just tried to talk sense in him with the help of Padmé. (cause she dies of a broken heart in ep III, I doubt she would have died if Obi-Wan and Anakin would have returned together) + the fact that he had children could have changed Anakin's mind too. If Anakin would have come back to the light side. He would do the same as his son. Create a new Jedi order...a better order, one where passion is allowed. Anakin spoke of ruling the galaxy together with Padmé...but how could he. Political he had not much experience, so Padmé would do most of the work, and she would have the oppertunity to convince Anakin to leave the power to the senate. This is all speculation but it is just my opinion because I think that Obi-Wan drew his lightsaber too soon!