I have the same problem with the NSA that I have with Google.
Suppose they are fine entities which won't do anything evil with the data they collect. Everything is okay then, right?
WRONG!
Nobody, not Google, not the NSA, not Apple, NOBODY, is unhackable. They're massive targets with a huge amount of value for cyber criminals to hack. The criminals hack in, steal whatever they want (your intimate pictures, your bank information, the school your children go to, your daily schedule, your address... more about you than you know about you!) and can get away without a trace (if they're good enough to get in, I don't doubt they're good enough to disappear without a trace.)