There's also a lot of context being ignored. Nude selfies are usually taken with a smartphone by someone who has numerous connected accounts and apps that can potentially have access to those pictures. And that's assuming they stay on your phone and not in the cloud by default. And that no one else is physically interacting with your phone.
In the dystopian hellscape of modern technology, everything is connected, your data is not your own, and privacy is obsolete. Fighting that trend and keeping your data secure is a constant battle that the typical user gave up on long ago.
Imagine if people were taking pictures of their passwords, credit card numbers, social security cards (or equivalent sensitive data for those in other countries) and various forms of identification. What would you need to do to feel those pictures were safe from unwanted attention? And would it really be surprising if someone pointed out that this is an unnecessary risk?