> E2EE wielded at scale by folks, a large subset of whom are engaging in criminal behavior
You cannot really engage in criminal behavior exclusively via E2EE communication. Victim would use the communication as evidence. All the crimes you are talking about have an essential component outside E2EE communication, which means that detection and evidence gathering is possible without breaking E2EE.
Aren't there criminal acts which consist solely of communicating information to a willing third party? Eg sharing classified information with a foreign agent?
You cannot really engage in criminal behavior exclusively via E2EE communication. Victim would use the communication as evidence. All the crimes you are talking about have an essential component outside E2EE communication, which means that detection and evidence gathering is possible without breaking E2EE.