The Order To exterminate all Jedi, The destruction of the Jedi Temple and fall of the Republic. At that time the Dark lord of siths rose from the ashes of the republic and era of dark began.
Any that aided the jedi were seen as enemies of the Empire as all jedi were seen as traitors.. Genocides of Alien races began also.
Order 66 Were in exact words the extermination of jedi nothing more. Clone troopers were actually prepared at birth and training for this specific order.
Technically Master Narretas was right.
~Arrius