The real underlying complaint that the snoopers and their government handlers have is not that stronger encryption protects the evil but that it protects the average. Terrorists, criminals and paedophiles know and use technology in ways to protect what they are up to and are not bothered by limits or restrictions put in place by the government or the manufacturers, since after all they are evil.
What the snoopers want to achieve is the second, third and beyond level of contacts. The mothers, the brothers and friends are who they want to snoop on and they want to cast their net wide in order to come up with as many possible links as possible. The fact that many innocent people may be looked at and even incorrectly associated is not their concern.
Current police and investigation powers are more than adequate to target specific individuals but this is not what they want, they want the ability to snoop on everyone and everything. Except themselves of course.
The ever increasingly shrill cries sounds less like reasoned concern and more like a child caught with their hand in the cookie jar. The criminal made me do it, no the terrorist made me do it, no wait, wait think about the children the paedos made me do it. Waaaaaaaaaaaa.