Having more ego (and the need to show it off) than sense isn’t just the usual explanation for megalomaniac supervillain types? Pride cometh before the fall and all that.

But yes, John’s twist on the formula is very charming to read, even if I’ve never had any problem believing that most other villains with the same sort of character flaw would share their plans out of overconfidence and a NEED to explain exactly how extraordinarily “intelligent” they are.