The comic proves the parent's point. Drugging and hitting people with a wrench (i.e. torturing) to extract information is exactly what police states do.
The comic has a non-literal meaning as well. (i.e. see the alt-text) The wrench can be a warrant, a confidential informant, or it can be a security camera, etc. Obviously, the world consists of more sources of information than encrypted data on your laptop and the information inside of your head.
Crimes happen in the real world, not behind a cipher. Some element of any crime is unencrypted and unencryptable.
I have to disagree with the alt-text. (For me it says, "In actual reality, nobody cares about his secrets.") It's flippant and out of touch. Because somebody does care about his secrets, otherwise mass surveillance wouldn't have reached totalitarian levels along with privacy becoming increasingly criminalized. So the more resource-intensive using the "wrench" is, the more privacy is protected.
