There is no solution because by definition any solution must be some kind of backdoor -- the explicitly stated goal is to allow retrospective access to encrypte

There is no solution because by definition any solution must be some kind of backdoor -- the explicitly stated goal is to allow retrospective access to encrypted communication without the consent or knowledge of the parties involved. To me, that is almost a textbook definition of a backdoor in an encrypted communication protocol. The blanket opposition isn't out of stubbornness and lack of understanding, it's because there is no way to simultaneously satisfy people who want a backdoor in every E2EE communication protocols and those who don't.