Also, the ability to "go dark" from the authorities needs to be understood to be a good thing, because sometimes the good guys are the authorities' enemy. That doesn't happen every day, but when it happens, it's critical for a resilient democracy that the people have the tools they need to resist.
Somewhat reduced law enforcement efficiency is worth trading for that societal resilience.
The protests in Hong Kong are a good example of this: they use E2E encryption apps to organize to support democracy and civil rights. They'd have been crushed long ago if they'd been forced to used surveillance-friendly communications tools like text messaging or WeChat.