I completely agree with you, but I do think that these teens do not have good opsec around these photos. It’s like the revenge porn problem but way worse. A teenager sending a nude selfie to a friend who then later shared these images non-consensually is a much bigger problem than if the same thing happened to adults.
I don’t have any ideas for a solution, but I suspect that the heightened focus on CSAM is really compensating for the fact that we don’t have solutions for revenge porn.