So it's "be a good person," but with then absolutely no follow-through or obligation attached: don't offer help, respond like an LLM when someone says something negative about the company that just sacked them, and don't even feel compelled to continue the conversation that you started if the person replies. Sounds to me like these goodbyes are more for the personal feelings of moral rectitude of the person making them, rather than anything related to the person who is departing. So it's really how to pretend to be a good person well enough to fool someone looking casually, a.k.a. instructions for being a passing sociopath.