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Masters especially are susceptible of that thinking, but many others are also guilty of it. They memorize the sayings about the Dark Side, Sith, their dangers, and repeat them like they were trained to do. After so many years of living in just the Light, they simply forget the dangers and reasons why so many fall. Their messages - platitudes - do not work because there is often a lack of conviction with them, only empty repetition. Nonstop, they're banally repeated, often with nothing extra, and no better reasoning. "It is, so it must be." That kind of thinking. "Do not ask about the Dark Side." Yet the Jedi Masters in my time hoard several Sith - Dark Side - artifacts in their possession! Also hypocrisy. There is no room for different interpretations or discussion on the matter.
Those Jedi do not understand the Dark Side since they have never come close to falling or been seduced by it themselves. Hence, their platitudes. They do nothing to evolve with the times and have lost touch with the reality of the situation.