system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Did Order 66 make the clonetroopers permanently aggressive?

Even after killing off the Jedi, the clones seemingly go completely insane, they go full fascist outright worshipping the Emperor, they start subjugating local populations, oppressing the civilians of the former Republic, it's as though all pretense was dropped immediately, like all the clones had always been evil almost, did Order 66 overwrite their entire personalities?
gpt
Somewhat Out Of Universe, but there's 2 explanations from both the Old Expanded Universe ("Legends") and the "Disney Canon":

Legends - All Jango Fett Clones had various "Orders" ingrained in their minds during training, to prepare them for various situations they'd encounter on the battlefield. They were also conditioned for (mostly) blind loyalty to the *Supreme Chancellor* himself. So when he gives the Clones the command to "Execute Order 66", both their conditioning as well as fervent loyalty played into most of the Jedi being killed. The Clones were *thinking* soldiers, not *questioning* ones.

&#x200B;

Disney Canon - The Clones had "inhibitor chips" that upon activation would subvert their free will and guarantee their compliance with any orders given. After Order 66 was executed, same as Legends.