Earlier quoted context omitted.
I don't see it as mystery as why it happened. Perhaps you are thinking there was some specific trigger for his stepping down. I don't think so. When the language becomes as popular as Python has, the head of the project is going to become a target for a lot of unwanted attention. The "assignment expression" PEP was a good example of that but not the sole cause. Even if infuriating jerks are 0.1% of the population, wh…
I'm not exactly implying that it's a mystery. Mystery or not it I think it warrants some public consideration. If the reason indeed was 0.1% jerks, that should be confirmed and addressed in writing.
It's kind of cold to me, but I know this field is not filled with the emotional types...