My point isn't that the use of the phrase is wrong, the point is that the colloquial understanding of the phrase is a bad concept. [All] lawyers are bad CEOs i

My point isn't that the use of the phrase is wrong, the point is that the colloquial understanding of the phrase is a bad concept. [All] lawyers are bad CEOs is a statement that was made. Evidence to the contrary was presented. "The exception proves the rule" was used to dismiss that evidence. It's used in a similar way as "God works in mysterious ways".