"PGP is easy to crack."

But that's not actually cracking PGP, is it?
That's just coercing the user into giving you the key!

Interestingly, i believe that it was a failure of the users to follow basic procedures which led to the Allies (Bletchley Park et al) cracking the Enigma code during WW2.

Which all goes to show that the weakest link is not the encryption technology, but the people using (or mis-using) it!