Originally Posted by MajinMikeyX
Besides, if Obi-Wan stayed to help out Yoda, Anakin would never have been burnt to a crisp and have his legs and an arm cut off by Obi-Wan, and we wouldn't have Vader.
That's the problem with the prequels honestly, Obi-Wan has to go there not because it's the decision that makes most sense, (Anakin was a pawn, if they kill Sidious and what he's gonna do? he's got nothing at this point) but because they were running out of time and needed to tie things together.
Maybe, if they made Obi-Wan say "I have to talk to him, i can still save him" or something to that effect it would make more sense for Obi-Wan to go after him.
If they had gone for that, i would have to cut the killing children thing, that's definetely too much to accept.