its my fault if i send a friend up the stairs, to stop the baby while its falling, when i could have instead used my friend to help catch the baby. of course the emperor and anakin are to blame. but obi wan and yoda should not have split up. their rookie arrogance caused more harm than it did good. perhaps if anakin wasn't maimed, then he could have checked the power of the emperor or destroyed him. or if as you say, obi wan was there to deal justice he should have finished anakin. leaving him alive was his second mistake. what the hell? i see what you are saying, but your illustration and obi wan's situation are completely different, one is reactive the other proactive.