>Bitcoin core developer is the nuttiest of bitcoin users?

In this case you can substitute "nuttiest" with "most lazy".

>The whole point is that he should be the one of most knowledgeable exemplary users.

In this case it wasn't because of lack of knowledge, it was something else (eg. laziness/apathy/cockiness). Kind of like how most people know that they should eat less and exercise more, but don't.

User laziness/apathy/cockiness are the unsolved part of key management.

https://en.wikipedia.org/wiki/Dancing_pigs

When a core aspect of a security system requires ignoring or fundamentally changing human nature, you have an irreparably broken security system.