[DFHippie]

"The exception that proves the rule" is an idiom that depends on a different meaning of the word "prove" from what you have in mind.

[thfuran]

No, that sense of the expression is just nonsense based on a misunderstanding of the actual expression.

[adolph]

Irregardless, if the misunderstanding is widespread enough, it literally becomes the meaning.

[peterfirefly]

I sanction that even thought it's all moot now.

[peterfirefly]

Really? It's #4 on the list:

https://en.wiktionary.org/wiki/prove#Verb

[Der_Einzige]

Expressions like this one or "it is what it is" are just boomerisms