However rhetoric can be used for good yadda yadda if it is used in the aim of justice yadda yadda in other words, discipline and punishment of wrong doing yadda yadda
Evil is a correlate of ignorance yadda yadda because knowledge in plato is NOT merely self attributed judgment but practical certainty in an goal directed craft that serves to preserve and maintain order and longevity and stability of life instead of immediacy of pleasure which is restless and endless unsatisfied.
This dialogue is cool because of Callicles, who is out of all Plato dialogues ive read is probably Socrates' most formidable rival in argument. Callicles defends a pseudo nietzschean(before nietzsche!) account of morality as a means for the weak to subdue the excesses of the strong, which he deems natural right, as opposed to the artificial law of the legislators of the city which produces. The only right is the right of conquest, and the only good is convenience of immediate pleasure seeking.
Socrates rebuts that a drive of pleasure seeking is restless and unstable, and causes one to live a life of anxiety and unsatisfaction
Callicles sees that a life which seeks to dull the lust of pleasure to be akin to seeking the death of pleasure and hence a "life of stone".
Socrates ends up convincing the interlocutors that even within pleasure seeking there are standards we seek by virtue of distinguishing good and bad pleasures, and that this distinction is precisely why pleasure should be seen as a means to a principle or end that is external to it.
Overall, pretty fun. Socrates provides a fun argument about how Statesmen have been failures at doing their job and that one should always be wary of them when it comes forging our path in the acquisition of truth and the good.