TCW S6E10, “The Lost Ones”, was the last chance for the Jedi to avoid Order 66, and they utterly bungled it. To quote the last part of the episode as best I remember:

Yoda: “Know now we do, that guide the creation of the clones from the beginning, Dooku did. Hmm…our enemy created an army, for us.”

Mace Windu: “If this was known, public support for the war effort, the Jedi, and the Republic would vanish; there would be mass chaos.”

Y: “ Cover up this discovery, we must; no one, not even the Chancellor, may know. Valiant men, the clones have proven to be; saved my life, and yours, they have, many times. Believe in them, we must; win the war swiftly, we must, before our enemy’s designs reach completion…whatever they may be.”

MW: “Are you sure we’re taking the right path?”

Y: “Hmm…the right path, no. The only path…yes. Designed by the Dark Lord of the Sith, this web is. For now, play his game, we must.”

I know things had to be in line with RotS, but Jesus Fucking Christ.