Darkness or Light? Philosophy in Knights of the Old Republic.

:D.
You shouldn't underestimate Obi-Wan... what else could he do besides trying to reason with him? Especially since Anakin wasn't listening.
If Anakin had listened to Yoda, Padme wouldn't have died, and he wouldn't have turned to the dark side... Unfortunately, you underestimate the Wisdom of a True Jedi :).

Obi-Wan could have talked more, presented a series of convincing arguments that would have been enough to bring Anakin to his senses... He could have acted like Palpatine, but from the Light Side...
Anakin's mistake was that he was taught to listen and obey... he couldn't think for himself, so everyone manipulated him... As a Jedi, he was just a weapon in the hands of others... And besides, he didn't know that his dreams were perfectly normal... They probably didn't tell him what a woman experiences during childbirth... because they were monks... incorrigible virgins:D
In principle, the choice is obvious... if you feel death approaching, you will try to save your loved one by all means... of course, since he was never taught to think, he cut off Mace's hand...
Mace Windu, by the way, also didn't learn to think... he was told that the Sith were such evil that they shouldn't even be listened to... and you can see how Palpatine provoked Mace and Anakin into specific actions during the battle... Well, what can you do if you're as dumb as a vegetable...