If you're of extreme interest to the US government or any of its allies, you must also assume
4) The authorities can read any of your encrypted data, if they find out it is associated with you, even if they do not acquire the keys.
If you assume encryption is useless, then what's the point? I would think that if you generate the key yourself and no one else knows/has it, then encrypted data is safe (assuming you are using a modern cryptosystem).
"The Avis WIZARD decides if you get to drive a car. Your head won't touch the pillow of a Sheraton unless their computer says it's okay." -- Arthur Miller