@16. To break pgp using a brute force attack may well take thousands of years of computer time. No one has shown that pgp encryption can be broken - even the NSA has to use current technology.

What if the guy forgot his passphrase. I encrypted a drive I didn't use (just to be trendy) and promptly forgot the password. doh.

Should I be subject to prosecution for contempt of court because I refuse to divulge the contents of my stupid disk that I never even use?

The police need to throw people who commit crime in jail, in this case they don't just have the evidence.