To be honest they’d strayed so far from the original Jedi with their extreme rules about emotions and connection they kind of need to fall. I don’t fault any of them individually (except maybe Yoda because he had to have been around before it got that extreme).
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I think Count Dooku mentions that in a novel or comic. Anyone who grows that old becomes complacent or corrupt, and less likely to act to the corruption that slowly builds over the centuries. I blame the Jedi Counsel more than Anakin. Palpatine groomed him since he was a child. Hard to blame Anakin for that.