How do you know they are criminals if you not already broke the encryption to gather evidence…
This is not about criminals, it is about the question if Internet should be a - room - without laws and total anarchy and anonymity.
There is no answer to this question because no one solved this problem, solving this would maybe require introducing a total police state, since you need more police on the streets to gather hard evidence to come to a conclusion if someone is a criminal or not in the first place.
Abusing the encryption system is widely-known in the malware and pedo scene and those are the first together with alt-right people hiding behind this.
To somewhat give my opinion on this…
Breaking or backdoor-ing encryption is not the answer, you even then need surveillance and even then we have a justice system which everyone should obey.
The internet should not be a virtual room without laws.
Do I have a solution, … nope, same like most people this is something which always will one way or another break something… our privacy … Our anonymity or our encryption system, it depends on what we are willingly to trade for more security. It is giving up something to gain something in return on the other side, at least that would be the concept, which I am not a fan of.
To somewhat give my opinion on this…