Electronic digital communications between private individuals span networks, servers and devices that cross multiple boundaries in both physical, technical, political and religious domains. What is acceptable and even the law in state A may be the opposite in state B - and by referencing 'state' here I mean nation states, not just the states that make up the US or Germany for example.
We live as a species perhaps for the first time ever, in a time when it is entirely possible, even relatively easy and convenient, to encrypt messages in ways that simply cannot be recovered, even with the force of a search warrant, properly authorized and duly served.
This represents a problem for law enforcement agencies that is a level up from what they had and have. All at a time when the fundamental nature of waging conflict has changed - it used to be between identifiable adversaries such as nation states - something that could be seen, targeted and attacked with some good chance of achieving desired outcomes for the attacker for example.
Many nations have legal protections for citizens' freedoms including personal privacy, right to not self-incriminate and so on - and these laws have been established because really bad things happened in their absence.
For law enforcement agencies to demand that there not be unfettered access to total privacy simply reflects an old-paradigm response to a new-paradigm problem. It's unlikely to be terribly helpful. Law enforcement agencies, more so in some countries than others perhaps, need to build a relationship with the citizenry that establishes or re-establishes mutual trust and co-operation, and results in a genuine partnership - just as the law enforcement agencies are executing some level of oversight on the citizenry, so the citizenry has a role in reciprocating. I see too many countries that arguably are falling back away from this kind of situation, falling back more on the 'force' aspect of law enforcement than on genuine partnership... behaviors & mindsets that are actually undermining trust and co-operation.