no, its not Obi-Wans fault that Anakin turned to the dark side...but, at the time, they were in the middle of the clone war, he was weak and beaten down at the time and they offered him to turn to the dark side to keep his life, he really didn't have a choice so he did...but it was definately NOT Obi-Wans fault, but Obi-Wan did blame himself for Anakin not being trained enough and turning to the dark side *wow, i admitted something bad about anakin and something good about obi-wan, and this is coming from the girl who would give her life for him, a character, well...i would for hayden too, but i wont go there now*