system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] In Revenge of the Sith; during Anakin’s and Obi Wan’s battle, there’s a momentary pause and some monologue about the chancellor being evil and points of view. Is this where Obi Wan actually failed Anakin?

If Kenobi had been less condemning and preachy and more sympathetic to the upset and fear that Anakin was feeling... maybe saying something to the effect of; “let me help you”, could Anakin possibly have been saved, or was he too far gone at this point?

It feels like the next moment of that scene is Obi taking the high ground, Anakin losing his limbs and being burned...  and screaming about hate.
gpt
No, but it is the moment where Obi-wan realized he had failed.

It would be pretty difficult to pin down one thing that Obi-wan did wrong. While Obi-wan was a competent Jedi and a good teacher, Anakin needed a different kind of guidance than what Obi-wan could provide. Their personal relationship ended up overshadowing Obi-wan's role as a teacher, and Palpatine eagerly stepped in to fill the position. 

By the time they reached Mustafar, there wasn't a whole lot that anyone could do for Anakin. Even if you concocted a scenario where Padme and the children are safe, Anakin had already started tumbling into the Dark Side.