The only quote out of those that was a direct Lucas criticism of the Jedi was
[The Jedi] sort of persuade people into doing the right thing but their job really isn’t to go around fighting people yet there are now used as generals and they are fighting a war and they are doing something they really weren’t meant to do. They are being corrupted by this war, by being forced to be generals instead of peacemakers. – George Lucas for E! Behind the Scenes - Star Wars Episode III Revenge of the Sith
This makes sense and is true, and they were sort of placed into that situation by Palpatine. They could have done a more thorough job to investigate where the clone army came from in episode 2, and you can argue that that was because they were getting seduced by the power of having an army, but in the movie it just looks foolish. Yoda is already aware that the war is a bad thing, and all throughout episode 3 they are trying to end the war as quickly as possible and not drag it out forever.
But the central “dogma” of renouncing attachment is something Lucas always said was a good thing, and fear was always what led you down. He’s said that as recently as last year. https://youtu.be/V7LhwO0EGi4
https://en.wikipedia.org/wiki/Jedi#Influences
"Lucas explained, the Jedi are trained, allowed and expected to love people, even their enemies, the Sith, but they are not supposed to form attachments and that’s because attachment led to the dark side of the Force.[9] When one was owning, having, possessing, getting or wanting and attaching to things, one become afraid to lose them, whether it to be pleasure, a person or experience. The fear of loss feeds into greed, wanting to keep things, thus, an attached person is selfish and unable to let go. The fear of loss turns into anger, which will lead to hate, and hate will lead into suffering, mostly on the part of the one who is selfish, because then one will spend their lives being afraid rather than actually living. Whereas compassion, the light side is caring and giving and thus it is love, and the opposite of attachment - it is everlasting joy, devoid of fear of loss and the pain of loss. “As long as you love other people and treat them kindly, you won’t be afraid.”[10]
Lucas, identifying himself as “Buddhist Methodist” or “Methodist Buddhist” stated that his philosophy of non-attachment, depicted in his movies was influenced by the fact that he was from San Francisco, the “Zen Buddhism capital of the United States”.[10] In 2020, he indicated that the Jedi were “designed to be a Buddhist monk who happened to be very good at fighting.”[3]"