Poll
54%
46%
It was Obi-Wan, it was Mace, it was Yoda, it was the Jedi in general, it was Padme. They all contributed in some way to Anakin's fall.
But that fall would likely not have happened had he not been fed a bunch of lies and half-truths from Palpatine. It was HIS fault.
Obi-Wan, because he was Anakin's master and teacher, felt it was HIS fault because that long-time student had failed as a Jedi.