Show proof of "instantly sunk". As you say no one has even fired at one since WW2. Have you ever been on one? I was on one during the Cold War that snuck up on Vladivostok. It's harder to find a carrier than you think.https://twitter.com/Pinboard/status/1442203993854255107 …
The proof of "instantly sunk" is wargames where (for example) a Dutch submarine tracked down and sank the Theodore Roosevelt by listening to its radar.