I think the entire Jedi council was suffering from brain-rot to be honest, Palpatine might as well have been wearing a T-Shirt with the motto 'I am an evil Sith Lord, how may I help you?' for episodes 2 and 3.
I think my one concern is that what Anakin did when he turned to the Dark side is kinda difficult to dissect, since I considered Mace's solution to the problem of the Emperor to be somewhat 'Dark Side' itself. Yet, when Palpatine had told Anakin that Dooku was 'too dangerous to be left alive', Anakin had taken it at face value, but did not apply the same rules to the situation with Mace and Sideous. So, in a strange way, Anakin turned to the Dark Side by actually following the Jedi code.