But that is why they were destroyed. They were complacent and couldn’t see the plot developing right under their noses. The OT establishes that Anakin himself was there before the Empire was established–putting a timeline on when the Empire was formed, and which means the Jedi allowed the political climate to shift specifically in Palpatine’s favor without stopping him.

They were idiots. That’s why they were killed. They were stupid enough to allow themselves to be hunted down and killed by the Empire. And that’s all just relying on information from the OT.