Oh dear lord, the hyperbole. We allow law enforcement access to all other forms of communication with a lawful warrant. So should this particular technology be exempt from that?
Then, let them serve the warrant.
What is different is that for the first time in human history, it's not only possible but it's practical to have encrypted communications that no one can access except for the intended recipient.
All of "the most heinous of crimes" take place in the real world, there is some physical action that can be detected and punished. I don't care if this makes the job of law enforcement harder. I want law enforcement to be a difficult and time consuming job. Idle and bored cops tend to find ways to fill their time and it's never good.
LK