But that Zhu Jiu jumps straight to murder in response, and shows no remorse afterwards, seemed to be his own choice to me. A non-psychopath might have begun rebelling more and more, questioning things, rousing the rabble, started radicalizing himself... and might well have ended up in the same place eventually. But to jump straight to murder?

Yeah, agreed. He really goes from "loyal guard" to "unrepentant murderer" in the blink of an eye, with no hesitation.

Meanwhile, the other people Ye Zun whispered to are probably the ones spreading the rumors the Envoy is a traitor... but that's all they're doing. Because they are not psychopaths. ;-)

Oooh, I like this! This makes so much sense to me. :D