To rebut: sociopaths exist.
Super obvious re-rebut: sociopaths exist, and yet civilization endures.
Also, we can rather obviously test in safe simulation sandboxes and avoid copying sociopaths. The argument that sociopaths are a fundemental showstopper must be based then on some magical view of the brain (because obviously evolution succeeds in producing non sociopaths, so we can copy its techniques if they are nonmagical).
Remember the argument is against existential threat level UFAI, not some fraction of evil AIs in a large population.
At some point soon, I'm going to attempt to steelman the position of those who reject the AI risk thesis, to see if it can be made solid. Here, I'm just asking if people can link to the most convincing arguments they've found against AI risk.
EDIT: Thanks for all the contribution! Keep them coming...