I think it can be hard to accept that sociopaths are serious, if you aren’t one yourself. In the USA right now the federal government is committing incredible crimes and human rights violations, and people reporting them from direct observation and even video aren’t being believed, because it sounds too much like comic book supervillan stuff.
I would say this easily goes either direction, that someone capable of this level of introspection and empathy would be very good at accomplishing the various evil aims he seems to have been capable of. This is often what people are abbreviating when leveling accusations of psychopathy anyway.
Not sure how the second bit follows - one can be a serious psychopath, sociopath, cartoon villain etc and it wouldn't change that the tone of the memo I is pretty obviously farcical, despite what the contemporary media read it for.
No one was sexist ever, they were just joking and all feminists were stupid not understanding that, until their quite sexist messages got released by inside a pack of messages to known abuser. This is literally the case of Larry Summers.
And you want to play that game again, with literally the same person. Of course no one believes it, it is not being sophisticated, you are asking people to pretend they are stupid. Nothing in Summers career suggests he would sarcastic out of care for Africa or environment. That is not what his work was, at all.
You don’t need to. The target audience was people to whom that’s obvious in the first few lines and then who keep reading to see how far he can take it with a straight face.