Earlier quoted context omitted.
I don't think they ever needed the ability to tap phones or read mail. Capabilities that were repeatedly abused, just like internet surveillance. Where will I commit this crime? Somewhere in meatspace or it doesn't matter. Cops can work backward from there.
I'm pretty confident you can commit crimes that matter without physical presence. Most people don't approve of making millions from insider trading, for example. Or of cryptolocking beloved photo collections and holding them ransom for bitcoin.
You can't stop cryptolocking by tapping a phone or by banning encryption.