Obi Wan was supposed to love Anakin. He was his brother! He set him on fire! He loved him! He cut off his legs! He's so sanctimonious about Anakin going Dark, he doesn't even try to save him from the Sith, or at least from dying a lava-hot fiery death. And when it's all over? Obi Wan just walks away. He doesn't even do his old friend the courtesy of mercy-finishing him off, leaving him to die slowly. On fire. With no legs.
Perhaps he was following the Jedi Code. After all, at the point where a red-eyed Anakin is legless and covered in burning lava, he's unarmed. It's against the Jedi Code to kill an unarmed opponent. So, Obi Wan follows code here, but that doesn't make the scene any easier to watch, nor does it make Obi Wan any less callous. He's put in a tough, almost impossible situation, and he follows his training. Which is to be a stone-cold, unfeeling Jedi.
Seriously, these are the heroes? In Episode I, Qui-Gon Jinn and Obi Wan rescue Anakin from the slave colony on Tatooine, but they totally leave his mom behind. They didn't have enough money to buy both of them, which makes sense, but TEN YEARS go by before Anakin goes back to look for his mother. In the meantime, he's living in the Jedi Temple, with all the resources of the Jedis (and presumably the Galactic government ) — they don't once even think to go back and buy his mom out of slavery? Guess it slipped their mind … or more likely, they didn't care. Too bad, because Anakin's rage surfaces when he takes revenge on the Tusken Raiders who killed his mom. It's, you know, pretty much the first time Darth Vader emerges. Thanks, Gon and Wan.
Then there's the potential death of innocents on the Death Star, Yoda giving zero effs about Luke's friends, and ghost Obi Wan defending his bald-faced lie Luke's father with that FROM A CERTAIN POINT OF VIEW nonsense. Well, FROM A POINT OF VIEW, if Luke had told ghost Kenobi to shut up and stayed with Yoda, the only truly moral Jedi around apparently, he would have been a better Jedi AND human. The green muppet is a better person than all the hero persons.