Yeah and I am completely against total surveillance as well. But we need some solution to catch these predators.
The main problem with the internet compared to sending mail is that everyone can be exposed to what is available online. Like for example on ZeroNet, on some chan-board I randomly visited, there were some csam that I got exposed to and it was not by choice...
I now had csam on my computer and I was now also helping distribute it since I had seen it. (Yay peer to peer internet). In the end I decided to deleted the ZeroNet program off of my computer and never come back.
I am not advocating for total surveillance or restrictions of rights but we need some solution to a real problem. If it's a technical solution or a societal solution I can not say.